build: bump actions/upload-artifact from 4 to 6

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 4 to 6.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](https://github.com/actions/upload-artifact/compare/v4...v6)

---
updated-dependencies:
- dependency-name: actions/upload-artifact
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/main.yml

@@ -39,14 +39,14 @@ jobs:
         run: ./gradlew clean shadowJar -x test -x checkstyleMain -x checkstyleTest -x spotbugsMain --info
 
       - name: Upload build results
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v6
         with:
           name: ${{ matrix.os }} Java ${{ matrix.java }} build results
           path: ${{ github.workspace }}/build/libs/
 
       - name: Upload test results
         if: ${{ always() }}
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v6
         with:
           name: ${{ matrix.os }} Java ${{ matrix.java }} test results
           path: ${{ github.workspace }}/build/reports/
@@ -70,7 +70,7 @@ jobs:
         run: ./gradlew -Pver="0.0.0-RC-1" clean shadowJar -x test -x checkstyleMain -x checkstyleTest -x spotbugsMain
 
       - name: Upload build results
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v6
         with:
           name: Release Build
           path: ${{ github.workspace }}/build/libs/

.github/workflows/pr.yml

@@ -38,14 +38,14 @@ jobs:
         run: ./gradlew clean shadowJar -x test -x checkstyleMain -x checkstyleTest -x spotbugsMain --info
 
       - name: Upload build results
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v6
         with:
           name: ${{ matrix.os }} Java ${{ matrix.java }} build results
           path: ${{ github.workspace }}/build/libs/
 
       - name: Upload test results
         if: ${{ always() }}
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v6
         with:
           name: ${{ matrix.os }} Java ${{ matrix.java }} test results
           path: ${{ github.workspace }}/build/reports/

.github/workflows/tag.yml

@@ -28,7 +28,7 @@ jobs:
         run: ./gradlew -Pver=${{ github.ref_name }} clean shadowJar -x test -x checkstyleMain -x checkstyleTest -x spotbugsMain
 
       - name: Upload build results
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v6
         with:
           name: Release Build
           path: ${{ github.workspace }}/build/libs/