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

Author: renovate[bot]

.github/workflows/helm-publish.yml

@@ -42,7 +42,7 @@ jobs:
 
     steps:
     - name: Checkout code
-      uses: actions/checkout@v4
+      uses: actions/checkout@v6
 
     - name: Login to GitHub Container Registry
       uses: docker/login-action@v3

.github/workflows/release.yml

@@ -22,7 +22,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           fetch-depth: 0