Bump actions/checkout from 3 to 4

Bumps [actions/checkout](https://github.com/actions/checkout) from 3 to 4.
- [Release notes](https://github.com/actions/checkout/releases)
- [Commits](actions/checkout@v3...v4)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/cronet.yml

@@ -26,7 +26,7 @@ jobs:
       run:
         working-directory: pkgs/cronet_http
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: subosito/flutter-action@v2
         with:
           # TODO: Change to 'stable' when a release version of flutter
@@ -48,7 +48,7 @@ jobs:
     name: "Build and test"
     runs-on: macos-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: actions/setup-java@v3
         with:
           distribution: 'zulu'

.github/workflows/cupertino.yml

@@ -28,7 +28,7 @@ jobs:
       run:
         working-directory: pkgs/cupertino_http
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: subosito/flutter-action@v2
         with:
           channel: 'stable'
@@ -63,7 +63,7 @@ jobs:
       run:
         working-directory: pkgs/cupertino_http/example
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: futureware-tech/simulator-action@v2
         with:
           model: 'iPhone 8'

.github/workflows/java.yml

@@ -29,7 +29,7 @@ jobs:
       run:
         working-directory: pkgs/java_http
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: subosito/flutter-action@v2
         with:
           channel: 'stable'
@@ -55,7 +55,7 @@ jobs:
         working-directory: pkgs/java_http
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: subosito/flutter-action@v2
         with:
           channel: 'stable'