Update examples in README to use checkout@v4

README.md

@@ -175,7 +175,7 @@ jobs:
   tests:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - uses: dorny/paths-filter@v2
       id: filter
       with:
@@ -235,7 +235,7 @@ jobs:
     if: ${{ needs.changes.outputs.backend == 'true' }}
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - ...
 
   # JOB to build and test frontend code
@@ -244,7 +244,7 @@ jobs:
     if: ${{ needs.changes.outputs.frontend == 'true' }}
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - ...
 ```
 
@@ -283,7 +283,7 @@ jobs:
         package: ${{ fromJSON(needs.changes.outputs.packages) }}
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - ...
 ```
 
@@ -307,7 +307,7 @@ jobs:
     permissions:
       pull-requests: read
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - uses: dorny/paths-filter@v2
       id: filter
       with:
@@ -328,7 +328,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
       with:
         # This may save additional git fetch roundtrip if
         # merge-base is found within latest 20 commits
@@ -356,7 +356,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - uses: dorny/paths-filter@v2
       id: filter
       with:
@@ -384,7 +384,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
 
       # Some action that modifies files tracked by git (e.g. code linter)
     - uses: johndoe/some-action@v1