chore(deps): update actions/checkout action to v6 (#390)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/dependency-automerge.yml

@@ -20,7 +20,7 @@ jobs:
     steps:
       # ✅ Step 1: Checkout the repo (Fixes "not a git repository" issue)
       - name: Checkout Repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       # ✅ Step 2: Authenticate GitHub CLI (Ensure gh CLI works)
       - name: Authenticate GitHub CLI

.github/workflows/test-coverage.yml

@@ -16,7 +16,7 @@ jobs:
         node-version: [ 'lts/*', 'current' ]
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - name: Use Node.js ${{ matrix.node-version }}
       uses: actions/setup-node@v6
       with: