Upgrade: 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/build.yml

@@ -10,7 +10,7 @@ jobs:
   build_java_project:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - uses: olafurpg/setup-scala@v13
       with:
         java-version: "adopt@1.11"

.github/workflows/publish-github-pages.yml

@@ -15,7 +15,7 @@ jobs:
           - { version: "2.12.12", binary-version: "2.12", java-version: "11" }
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - uses: actions/setup-java@v1
         with:
           java-version: ${{ matrix.scala.java-version }}

.github/workflows/release.yml

@@ -16,7 +16,7 @@ jobs:
           - { binary-version: "2.13", java-version: "adopt@1.11" }
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - uses: olafurpg/setup-scala@v13
       with:
         java-version: ${{ matrix.scala.java-version }}