with the release of rust 1.67, let's bump to 1.66.1 (#7866)

# Description

This PR bumps the required rust version to 1.66.1.

# User-Facing Changes


# Tests + Formatting

Don't forget to add tests that cover your changes.

Make sure you've run and fixed any issues with these commands:

- `cargo fmt --all -- --check` to check standard code formatting (`cargo
fmt --all` applies these changes)
- `cargo clippy --workspace -- -D warnings -D clippy::unwrap_used -A
clippy::needless_collect` to check that you're using the standard code
style
- `cargo test --workspace` to check that all tests pass

# After Submitting

If your PR had any user-facing changes, update [the
documentation](https://github.com/nushell/nushell.github.io) after the
PR is merged, if necessary. This will help us keep the docs up to date.

crates/nu-command/src/bits/rotate_left.rs

@@ -132,7 +132,7 @@ fn operate(value: Value, bits: usize, head: Span, signed: bool, number_size: Num
                 SignedOne => get_rotate_left(val as i8, bits, span),
                 SignedTwo => get_rotate_left(val as i16, bits, span),
                 SignedFour => get_rotate_left(val as i32, bits, span),
-                SignedEight => get_rotate_left(val as i64, bits, span),
+                SignedEight => get_rotate_left(val, bits, span),
             }
         }
         // Propagate errors by explicitly matching them before the final case.

crates/nu-command/src/bits/rotate_right.rs

@@ -136,7 +136,7 @@ fn operate(value: Value, bits: usize, head: Span, signed: bool, number_size: Num
                 SignedOne => get_rotate_right(val as i8, bits, span),
                 SignedTwo => get_rotate_right(val as i16, bits, span),
                 SignedFour => get_rotate_right(val as i32, bits, span),
-                SignedEight => get_rotate_right(val as i64, bits, span),
+                SignedEight => get_rotate_right(val, bits, span),
             }
         }
         // Propagate errors by explicitly matching them before the final case.

crates/nu-command/src/bits/shift_left.rs

@@ -158,7 +158,7 @@ fn operate(value: Value, bits: usize, head: Span, signed: bool, number_size: Num
                 SignedOne => get_shift_left(val as i8, bits, span),
                 SignedTwo => get_shift_left(val as i16, bits, span),
                 SignedFour => get_shift_left(val as i32, bits, span),
-                SignedEight => get_shift_left(val as i64, bits, span),
+                SignedEight => get_shift_left(val, bits, span),
             }
         }
         // Propagate errors by explicitly matching them before the final case.

crates/nu-command/src/bits/shift_right.rs

@@ -148,7 +148,7 @@ fn operate(value: Value, bits: usize, head: Span, signed: bool, number_size: Num
                 SignedOne => get_shift_right(val as i8, bits, span),
                 SignedTwo => get_shift_right(val as i16, bits, span),
                 SignedFour => get_shift_right(val as i32, bits, span),
-                SignedEight => get_shift_right(val as i64, bits, span),
+                SignedEight => get_shift_right(val, bits, span),
             }
         }
         // Propagate errors by explicitly matching them before the final case.

crates/nu-command/src/dataframe/eager/get.rs

@@ -67,7 +67,7 @@ fn command(
     let df = NuDataFrame::try_from_pipeline(input, call.head)?;
 
     df.as_ref()
-        .select(&col_string)
+        .select(col_string)
         .map_err(|e| {
             ShellError::GenericError(
                 "Error selecting columns".into(),

crates/nu-command/src/dataframe/values/nu_dataframe/conversion.rs

@@ -307,10 +307,7 @@ pub fn create_column(
                 .skip(from_row)
                 .take(size)
                 .map(|v| match v {
-                    Some(a) => Value::Int {
-                        val: a as i64,
-                        span,
-                    },
+                    Some(a) => Value::Int { val: a, span },
                     None => Value::Nothing { span },
                 })
                 .collect::<Vec<Value>>();

crates/nu-command/src/strings/encode_decode/base64.rs

@@ -151,8 +151,7 @@ fn action(
                     let val = val.clone();
                     let val = val.replace("\r\n", "").replace('\n', "");
 
-                    //match Engine::decode_string(&val, base64_engine) {
-                    match base64_engine.decode(&val) {
+                    match base64_engine.decode(val) {
                         Ok(decoded_value) => {
                             if output_binary {
                                 Value::binary(decoded_value, command_span)

crates/nu-command/src/system/which_.rs

@@ -266,7 +266,13 @@ fn which(
     let paths = env::path_str(engine_state, stack, call.head)?;
 
     for app in which_args.applications {
-        let values = which_single(app, which_args.all, engine_state, &cwd, &paths);
+        let values = which_single(
+            app,
+            which_args.all,
+            engine_state,
+            cwd.clone(),
+            paths.clone(),
+        );
         output.extend(values);
     }
 

crates/nu-command/src/viewers/table.rs

@@ -1775,6 +1775,7 @@ enum TableView {
     },
 }
 
+#[allow(clippy::manual_filter)]
 fn strip_output_color(output: Option<String>, config: &Config) -> Option<String> {
     match output {
         Some(output) => {