ci: scope down GitHub Token permissions (#256)

Author: AdnaneKhan

.github/workflows/closed-issue-message.yml

@@ -2,6 +2,9 @@ name: Closed Issue Message
 on:
     issues:
        types: [closed]
+permissions:
+  issues: write
+
 jobs:
     auto_comment:
         runs-on: ubuntu-latest

.github/workflows/stale_issues.yml

@@ -5,6 +5,9 @@ on:
   schedule:
   - cron: "0 0 * * *"
 
+permissions:
+  issues: write
+
 jobs:
   cleanup:
     runs-on: ubuntu-latest

.github/workflows/tests.yml

@@ -7,6 +7,9 @@ on:
   pull_request:
     branches: [ master ]
 
+permissions:
+  contents: read
+
 jobs:
   run:
     runs-on: ubuntu-latest