chore(deps): update actions/checkout action to v6 (#27)

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

Author: renovate[bot]

.github/workflows/release.yml

@@ -28,7 +28,7 @@ jobs:
           # Split and keep last
           echo "APP_NAME=${GITHUB_REPOSITORY##*/}" >> $GITHUB_ENV
 
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Validate composer.json and composer.lock
         run: composer validate --strict

.github/workflows/test.yml

@@ -53,7 +53,7 @@ jobs:
       - name: Copy Nextcloud source
         run: ln -s /usr/src/nextcloud/* ${GITHUB_WORKSPACE}/
 
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           path: apps/fulltextsearch_sql