bump rust-toolchain to 1.72.1 (#11079)

# Description

This PR follows our process of staying 2 releases behind rust. 1.74.0
was released today so we update to 1.72.1.

Reference https://releases.rs/

# User-Facing Changes
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helps us keep track of breaking changes. -->

# Tests + Formatting
<!--
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Make sure you've run and fixed any issues with these commands:

- `cargo fmt --all -- --check` to check standard code formatting (`cargo
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crates/nu-std"` to run the tests for the standard library

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crates/nu-command/tests/commands/cd.rs

@@ -269,10 +269,10 @@ fn cd_permission_denied_folder() {
         sandbox.mkdir("banned");
         let actual = nu!(
             cwd: dirs.test(),
-            r#"
+            r"
                 icacls banned /deny BUILTIN\Administrators:F
                 cd banned
-            "#
+            "
         );
         assert!(actual.err.contains("Folder is not able to read"));
     });

crates/nu-command/tests/commands/path/parse.rs

@@ -5,11 +5,11 @@ use nu_test_support::{nu, pipeline};
 fn parses_single_path_prefix() {
     let actual = nu!(
         cwd: "tests", pipeline(
-        r#"
+        r"
             echo 'C:\users\viking\spam.txt'
             | path parse
             | get prefix
-        "#
+        "
     ));
 
     assert_eq!(actual.out, "C:");

crates/nu-command/tests/format_conversions/csv.rs

@@ -183,6 +183,7 @@ fn from_csv_text_with_tab_separator_to_table() {
 }
 
 #[test]
+#[allow(clippy::needless_raw_string_hashes)]
 fn from_csv_text_with_comments_to_table() {
     Playground::setup("filter_from_csv_test_5", |dirs, sandbox| {
         sandbox.with_files(vec![FileWithContentToBeTrimmed(

crates/nu-command/tests/format_conversions/tsv.rs

@@ -106,6 +106,7 @@ fn from_tsv_text_to_table() {
 }
 
 #[test]
+#[allow(clippy::needless_raw_string_hashes)]
 fn from_tsv_text_with_comments_to_table() {
     Playground::setup("filter_from_tsv_test_2", |dirs, sandbox| {
         sandbox.with_files(vec![FileWithContentToBeTrimmed(