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

Author: renovate[bot]

.github/workflows/test-jq-version.yml

@@ -25,7 +25,7 @@ jobs:
     needs: [setup]
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: 'Setup jq'
         uses: dcarbone/[email protected]

.github/workflows/test-pr-closed.yml

@@ -25,7 +25,7 @@ jobs:
     needs: [setup]
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - uses: ./
         id: current

.github/workflows/test-pr-opened.yml

@@ -25,7 +25,7 @@ jobs:
     needs: [setup]
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - uses: ./
         id: current