chore(gh): update stale workflow

Updates to stale workflow:

- Limits workflow permissions.
- Removes superfluous quotes.
- Pins actions to release commit hash.

Signed-off-by: Ryan Johnson <[email protected]>

Author: tenthirtyam

.github/workflows/govmomi-stale.yaml

@@ -1,45 +1,36 @@
-#  Copyright (c) 2021 VMware, Inc. All Rights Reserved.
-#
-#  Licensed under the Apache License, Version 2.0 (the "License");
-#  you may not use this file except in compliance with the License.
-#  You may obtain a copy of the License at
-#
-#  http://www.apache.org/licenses/LICENSE-2.0
-#
-#  Unless required by applicable law or agreed to in writing, software
-#  distributed under the License is distributed on an "AS IS" BASIS,
-#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-#  See the License for the specific language governing permissions and
-#  limitations under the License.
-
 name: Close Stale
 
+permissions:
+  contents: read
+  issues: write
+  pull-requests: write
+
 on:
   schedule:
-    - cron: "0 1 * * *" # daily
+    - cron: 0 1 * * *
 
 jobs:
   stale:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: "actions/stale@v9"
+      - uses: actions/stale@28ca1036281a5e5922ead5184a1bbf96e5fc984e # v9.0.0
         with:
-          repo-token: "${{ secrets.GITHUB_TOKEN }}" # No need to setup
+          repo-token: "${{ secrets.GITHUB_TOKEN }}"
 
           stale-issue-message: |-
             This issue is stale because it has been open for 90 days with no
             activity. It will automatically close after 30 more days of
             inactivity. Mark as fresh by adding the comment `/remove-lifecycle stale`.
-          stale-issue-label: "lifecycle/stale"
-          exempt-issue-labels: "lifecycle/frozen"
+          stale-issue-label: lifecycle/stale
+          exempt-issue-labels: lifecycle/frozen
 
           stale-pr-message: |-
-            This Pull Request is stale because it has been open for 90 days with
+            This pull request is stale because it has been open for 90 days with
             no activity. It will automatically close after 30 more days of
             inactivity. Mark as fresh by adding the comment `/remove-lifecycle stale`.
-          stale-pr-label: "lifecycle/stale"
-          exempt-pr-labels: "lifecycle/frozen"
+          stale-pr-label: lifecycle/stale
+          exempt-pr-labels: lifecycle/frozen
 
           days-before-stale: 90
           days-before-close: 30