workflows/dismissed-review: drop

This doesn't work, because it doesn't have the required permissions to
make any modifications.

.github/workflows/dismissed-review.yml

@@ -1,30 +0,0 @@
-name: Dismissed Review
-
-on:
-  pull_request_review:
-    types: [dismissed]
-
-permissions:
-  pull-requests: write
-
-jobs:
-  # The check-cherry-picks workflow creates review comments,
-  # that should sometimes be manually dismissed.
-  # When a CI-generated review is dismissed, this job automatically
-  # minimizes it, to prevent it from cluttering the PR.
-  minimize:
-    name: Minimize as resolved
-    if: github.event.review.user.login == 'github-actions[bot]'
-    runs-on: ubuntu-24.04-arm
-    steps:
-      - uses: actions/github-script@60a0d83039c74a4aee543508d2ffcb1c3799cdea # v7.0.1
-        with:
-          script: |
-            await github.graphql(`mutation($node_id:ID!) {
-              minimizeComment(input: {
-                classifier: RESOLVED,
-                subjectId: $node_id
-              })
-              { clientMutationId }
-            }`, { node_id: context.payload.review.node_id })
-