Update actions/checkout action to v5 (#45593)

Co-authored-by: Renovate Bot <[email protected]>

Committed via a GitHub action: https://github.com/Automattic/jetpack/actions/runs/18747913602

Upstream-Ref: Automattic/jetpack@29137ce

Author: tbradsha

.github/workflows/autotagger.yml

@@ -22,7 +22,7 @@ jobs:
             exit 1
           fi
 
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
         with:
           # We want to potentially trigger "tag" events, but the default GITHUB_TOKEN
           # explicitly does not trigger events.