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

Author: renovate[bot]

.github/workflows/pre-release.yml

@@ -8,7 +8,7 @@ jobs:
   prerelease:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: actions/setup-node@v3
         with:
           node-version: '*'

.github/workflows/release-please.yml

@@ -18,7 +18,7 @@ jobs:
           token: ${{ steps.get-token.outputs.token }}
           release-type: node
           package-name: '@netlify/plugin-nextjs'
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         if: ${{ steps.release.outputs.release_created }}
       - uses: actions/setup-node@v3
         with: