request-review.yml still referenced tj-actions/changed-files@v41, the
action and version range hit by the March 2025 supply chain compromise
(GHSA-mrrh-fwg8-r2c3): the attacker re-pointed existing version tags at
code that dumped the runner's memory, including the job's GITHUB_TOKEN,
into the public build logs.
Bump to v46.0.5, pinned by commit SHA so the ref cannot be re-pointed
again; the two other call sites already on v46 get the same pin in the
next commit. The action's file-matching API is unchanged between v41
and v46 for the patterns used here.