chore: scope GITHUB_TOKEN to contents: read in workflows

.github/workflows/changelog.yml

@@ -10,6 +10,9 @@ on:
     branches: [ 1.x ]
     paths:
       - CHANGELOG.md
+permissions:
+  contents: read
+
 jobs:
   build:
     runs-on: ubuntu-latest

.github/workflows/static.yml

@@ -2,6 +2,9 @@ name: Static Analysis
 
 on: ['push', 'pull_request']
 
+permissions:
+  contents: read
+
 jobs:
   cs:
     runs-on: ubuntu-latest

.github/workflows/tests.yml

@@ -2,6 +2,9 @@ name: Tests
 
 on: ['push', 'pull_request']
 
+permissions:
+  contents: read
+
 jobs:
   ci:
     runs-on: ${{ matrix.os }}