chore(deps): update actions/checkout action to v4

Author: renovate[bot]

.github/workflows/release.yaml

@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
         # https://github.com/helm/chart-releaser-action/issues/71#issuecomment-877822669
         with:
           fetch-depth: 0

.github/workflows/test.yaml

@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
 
       - name: Run chart-testing (lint)
         run: make lint