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

Author: renovate[bot]

.github/workflows/merge-main.yml

@@ -21,7 +21,7 @@ jobs:
       release_notes: ${{ steps.semantic.outputs.new_release_notes }}
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
       with:
         token: ${{ secrets.ACCESS_TOKEN }}
 

.github/workflows/pull-request.yml

@@ -18,7 +18,7 @@ jobs:
     runs-on: ubuntu-20.04
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
 
     - uses: swift-actions/setup-swift@v1
       with: