Use const over static for string literals (#18635)

I noticed a few places where we were storing `&'static str`s in
`static`s instead of `const`s.

This PR updates them to use `const`.

Release Notes:

- N/A

crates/task/src/vscode_format.rs

@@ -200,7 +200,7 @@ mod tests {
 
     #[test]
     fn can_deserialize_ts_tasks() {
-        static TYPESCRIPT_TASKS: &str = include_str!("../test_data/typescript.json");
+        const TYPESCRIPT_TASKS: &str = include_str!("../test_data/typescript.json");
         let vscode_definitions: VsCodeTaskFile =
             serde_json_lenient::from_str(TYPESCRIPT_TASKS).unwrap();
 
@@ -290,7 +290,7 @@ mod tests {
 
     #[test]
     fn can_deserialize_rust_analyzer_tasks() {
-        static RUST_ANALYZER_TASKS: &str = include_str!("../test_data/rust-analyzer.json");
+        const RUST_ANALYZER_TASKS: &str = include_str!("../test_data/rust-analyzer.json");
         let vscode_definitions: VsCodeTaskFile =
             serde_json_lenient::from_str(RUST_ANALYZER_TASKS).unwrap();
         let expected = vec![