Update actions/checkout action to v4

Author: renovate[bot]

templates/plate-playground-template/.github/workflows/build.yml

@@ -16,7 +16,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout Repo
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           # Fetch all git history so that yarn workspaces --since can compare with the correct commits
           # @link https://github.com/actions/checkout#fetch-all-history-for-all-tags-and-branches

templates/plate-template/.github/workflows/build.yml

@@ -16,7 +16,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout Repo
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           # Fetch all git history so that yarn workspaces --since can compare with the correct commits
           # @link https://github.com/actions/checkout#fetch-all-history-for-all-tags-and-branches