Bump actions/checkout from 2 to 4

Bumps [actions/checkout](https://github.com/actions/checkout) from 2 to 4.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v2...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/Publish-Website.yml

@@ -15,7 +15,7 @@ jobs:
 
     steps:
       - name: Checkout the repo
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
 
       - name: Set up Python 3.8
         uses: actions/setup-python@v2

.github/workflows/Release.yml

@@ -11,7 +11,7 @@ jobs:
 
     steps:
       - name: Checkout the repo
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
 
       - name: Validate Gradle Wrapper
         uses: gradle/wrapper-validation-action@v1

.github/workflows/Test.yml

@@ -28,7 +28,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
 
       - name: Test
         run: ${{ matrix.cmd }}
@@ -53,7 +53,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
 
       - name: Validate Gradle Wrapper
         uses: gradle/wrapper-validation-action@v1

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

@@ -9,5 +9,5 @@ jobs:
     name: "Validation"
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - uses: gradle/wrapper-validation-action@v1