Bump actions/checkout from 2 to 3

Bumps [actions/checkout](https://github.com/actions/checkout) from 2 to 3.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v2...v3)

---
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/android-ci.yml

@@ -21,7 +21,7 @@ jobs:
         java_version: [8]
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
         with:
           fetch-depth: 0
       - name: Install JDK ${{ matrix.java_version }}

.github/workflows/ci.yml

@@ -22,7 +22,7 @@ jobs:
     name: Test JDK ${{ matrix.java }}, ${{ matrix.os }}
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - name: Set up JDK
         uses: actions/setup-java@v2
         with:

.github/workflows/combine-prs.yml

@@ -95,7 +95,7 @@ jobs:
             console.log('Combined: ' + combined);
             return combined
       # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
         with:
           fetch-depth: 0
       # Creates a branch with other PR branches merged together

.github/workflows/gradle-wrapper-validation.yml

@@ -17,5 +17,5 @@ jobs:
       run:
         working-directory: jsonschema2pojo-gradle-plugin/example/android
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - uses: gradle/wrapper-validation-action@v1