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] <support@github.com>

.github/workflows/ci.yml

@@ -29,7 +29,7 @@ jobs:
     steps:
 
       - name: 1. Check out code
-        uses: actions/checkout@v2 # https://github.com/actions/checkout
+        uses: actions/checkout@v3 # https://github.com/actions/checkout
 
       - name: 2. Set up Java 8
         uses: actions/setup-java@v2 # https://github.com/actions/setup-java
@@ -59,7 +59,7 @@ jobs:
     steps:
 
     - name: 1. Check out code
-      uses: actions/checkout@v2 # https://github.com/actions/checkout
+      uses: actions/checkout@v3 # https://github.com/actions/checkout
 
     - name: 2. Set up Java ${{ matrix.java }}
       uses: actions/setup-java@v2 # https://github.com/actions/setup-java
@@ -87,7 +87,7 @@ jobs:
     steps:
 
     - name: Check out code
-      uses: actions/checkout@v2 # https://github.com/actions/checkout
+      uses: actions/checkout@v3 # https://github.com/actions/checkout
       with:
         fetch-depth: '0' # https://github.com/shipkit/shipkit-changelog#fetch-depth-on-ci