ci: enforce least-privilege permissions and update workflows (#188)

* ci: add permissions: {} to CI workflow with job-level contents: read

* ci: enforce least-privilege permissions in security workflow

* ci: enforce least-privilege permissions in commitlint workflow

* ci: enforce least-privilege permissions in pr-lint workflow and update actions

* ci: enforce least-privilege permissions in stale workflow and update actions

* ci: enforce least-privilege permissions in sync-labels workflow and update actions

* ci: enforce least-privilege permissions in release workflow and update actions

* chore(actions): update ivuorinen/actions/codeql-analysis (v2026.03.06 → v2026.03.09)

* chore(deps): update testdata composite action dependencies

.github/workflows/ci.yml

@@ -5,9 +5,14 @@ on:
     branches: [main]
   pull_request:
     branches: [main]
+
+permissions: {}
+
 jobs:
   test:
     runs-on: ubuntu-latest
+    permissions:
+      contents: read
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
         with: