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

Author: renovate[bot]

.github/workflows/auto-merge.yml

@@ -15,7 +15,7 @@ jobs:
     if: (github.actor == 'dependabot[bot]' || github.actor == 'renovate[bot]') && github.repository == 'internetee/whois'
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Install GitHub CLI
         run: |

.github/workflows/deploy-pr-staging.yml

@@ -26,7 +26,7 @@ jobs:
 
     steps:
       - name: ⬇️ Checkout application code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           ref: refs/pull/${{ github.event.inputs.pr_number }}/merge
 

.github/workflows/test.yml

@@ -36,7 +36,7 @@ jobs:
       DISABLE_SPRING: 1
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - uses: ruby/setup-ruby@v1
         with: