Update actions/checkout action to v4

renovate[bot] · web-flow · commit 694ec499e6aa · 2023-10-23T14:29:34.000Z
diff --git a/.github/workflows/deploy-theme.yml b/.github/workflows/deploy-theme.yml
@@ -9,7 +9,7 @@ jobs:
   deploy:
     runs-on: ubuntu-22.04
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Deploy Ghost Theme
         uses: TryGhost/action-deploy-theme@v1
         with:
