ci: Install actions-label-commenter"

https://github.com/peaceiris/actions-label-commenter

.github/label-commenter-config.yml

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+labels:
+  - name: resolved
+    labeled:
+      issue:
+        body: |
+          This issue has been **LOCKED** because of it being resolved!
+
+          The issue has been fixed and is therefore considered resolved.
+          If you still encounter this or it has changed, open a new issue instead of responding to solved ones.
+        action: close
+        locking: lock
+        lock_reason: resolved

.github/workflows/label-commenter.yml

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+name: Label Commenter
+
+on:
+  issues:
+    types:
+      - labeled
+      - unlabeled
+  pull_request_target:
+    types:
+      - labeled
+      - unlabeled
+
+permissions:
+  contents: read
+  issues: write
+  pull-requests: write
+
+jobs:
+  comment:
+    runs-on: ubuntu-20.04
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Label Commenter
+        uses: peaceiris/actions-label-commenter@v1
+        env:
+          RUNNER_DEBUG: 1