Rollup merge of rust-lang#108024 - zephaniahong:master, r=jyn514

add message to update Cargo.toml when x is changed

`@jyn514` Is this correct?

As mentioned in rust-lang#108021

Author: matthiaskrgr

triagebot.toml

@@ -468,6 +468,9 @@ This was probably unintentional and should be reverted before this PR is merged.
 If this was intentional then you can ignore this comment.
 """
 
+[mentions."src/tools/x"]
+message = "`src/tools/x` was changed. Bump version of Cargo.toml in `src/tools/x` so tidy will suggest installing the new version."
+
 [assign]
 warn_non_default_branch = true
 contributing_url = "https://rustc-dev-guide.rust-lang.org/contributing.html"