Make rust_tools_util package compatible with current stable by lowering rust edition to 2021.

Author: ignatz

rustc_tools_util/Cargo.toml

@@ -1,12 +1,12 @@
 [package]
 name = "rustc_tools_util"
-version = "0.4.1"
+version = "0.4.2"
 description = "small helper to generate version information for git packages"
 repository = "https://github.com/rust-lang/rust-clippy"
 readme = "README.md"
 license = "MIT OR Apache-2.0"
 keywords = ["rustc", "tool", "git", "version", "hash"]
 categories = ["development-tools"]
-edition = "2024"
+edition = "2021"
 
 [dependencies]

rustc_tools_util/src/lib.rs

@@ -188,7 +188,7 @@ mod test {
         let vi = get_version_info!();
         assert_eq!(vi.major, 0);
         assert_eq!(vi.minor, 4);
-        assert_eq!(vi.patch, 1);
+        assert_eq!(vi.patch, 2);
         assert_eq!(vi.crate_name, "rustc_tools_util");
         // hard to make positive tests for these since they will always change
         assert!(vi.commit_hash.is_none());
@@ -200,7 +200,7 @@ mod test {
     #[test]
     fn test_display_local() {
         let vi = get_version_info!();
-        assert_eq!(vi.to_string(), "rustc_tools_util 0.4.1");
+        assert_eq!(vi.to_string(), "rustc_tools_util 0.4.2");
     }
 
     #[test]
@@ -209,7 +209,7 @@ mod test {
         let s = format!("{vi:?}");
         assert_eq!(
             s,
-            "VersionInfo { crate_name: \"rustc_tools_util\", major: 0, minor: 4, patch: 1 }"
+            "VersionInfo { crate_name: \"rustc_tools_util\", major: 0, minor: 4, patch: 2 }"
         );
     }
 }