build(deps): revert change to checkout@v3

The previous commit accidentally reverted the updated reference to
checkout@v4. This re-introduces it.
diff --git a/.github/workflows/chart-releaser.yaml b/.github/workflows/chart-releaser.yaml
index 0c3d640..510ae96 100644
--- a/.github/workflows/chart-releaser.yaml
+++ b/.github/workflows/chart-releaser.yaml
@@ -14,7 +14,7 @@
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           fetch-depth: 0
           persist-credentials: false
diff --git a/.github/workflows/chart-test.yaml b/.github/workflows/chart-test.yaml
index 39f7856..c014d82 100644
--- a/.github/workflows/chart-test.yaml
+++ b/.github/workflows/chart-test.yaml
@@ -20,7 +20,7 @@
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           fetch-depth: 0
           persist-credentials: false
@@ -41,7 +41,7 @@
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           fetch-depth: 0
           persist-credentials: false