bump nushell to dev version 0.84.1 (#10101)

# Description

This PR bumps nushell from release version 0.84.0 to dev version 0.84.1.

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

# Tests + Formatting
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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
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- `cargo clippy --workspace -- -D warnings -D clippy::unwrap_used` to
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- `cargo test --workspace` to check that all tests pass
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crates/nu-std"` to run the tests for the standard library

> **Note**
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> toolkit check pr
> ```
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crates/nu-utils/src/sample_config/default_config.nu

@@ -1,6 +1,6 @@
 # Nushell Config File
 #
-# version = "0.84.0"
+# version = "0.84.1"
 
 # For more information on defining custom themes, see
 # https://www.nushell.sh/book/coloring_and_theming.html
@@ -31,7 +31,7 @@ let dark_theme = {
     list: white
     block: white
     hints: dark_gray
-    search_result: {bg: red fg: white}    
+    search_result: {bg: red fg: white}
     shape_and: purple_bold
     shape_binary: purple_bold
     shape_block: blue_bold
@@ -94,7 +94,7 @@ let light_theme = {
     list: white
     block: white
     hints: dark_gray
-    search_result: {fg: white bg: red}    
+    search_result: {fg: white bg: red}
     shape_and: purple_bold
     shape_binary: purple_bold
     shape_block: blue_bold

crates/nu-utils/src/sample_config/default_env.nu

@@ -1,6 +1,6 @@
 # Nushell Environment Config File
 #
-# version = "0.84.0"
+# version = "0.84.1"
 
 def create_left_prompt [] {
     mut home = ""