Bump actions/checkout from 2.4.0 to 3.0.0

Bumps [actions/checkout](https://github.com/actions/checkout) from 2.4.0 to 3.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v2.4.0...v3)

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

Author: plamentotev

.github/workflows/maven.yml

@@ -64,7 +64,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v2.4.0
+        uses: actions/checkout@v3.0.0
 
       - name: Set up JDK
         uses: actions/setup-java@v3.0.0
@@ -92,7 +92,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v2.4.0
+        uses: actions/checkout@v3.0.0
 
       - name: Set up JDK
         uses: actions/setup-java@v3.0.0