[ci] Bump actions/checkout from 4 to 6

Signed-off-by: Chris Cranford <chris@hibernate.org>

Author: Naros

.github/workflows/release-charts.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           fetch-depth: 0
 

.github/workflows/sanity-check.yml

@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
       - name: Commit messages in format DBZ-xxx
         env:
           BASE_REF: ${{ github.base_ref }}