build: revert to using classic token

Signed-off-by: Philipp Burckhardt <pburckhardt@outlook.com>

Author: Planeshifter

.github/workflows/cleanup_coverage.yml

@@ -169,7 +169,7 @@ jobs:
           commit-message: 'chore: cleanup coverage directories'
           committer: 'stdlib-bot <82920195+stdlib-bot@users.noreply.github.com>'
           signoff: true
-          token: ${{ secrets.STDLIB_BOT_FGPAT_PR_WRITE }}
+          token: ${{ secrets.STDLIB_BOT_PAT_REPO_WRITE }}
           labels: |
             automated-pr
           team-reviewers: |