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](actions/upload-artifact@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>

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -249,7 +249,7 @@ jobs:
           -Dsonar.projectVersion=${{ env.OBS_MAJOR_VERSION }}
 
     - name: Upload Build Asset
-      uses: actions/upload-artifact@v4
+      uses: actions/upload-artifact@v6
       with:
         name: obs-${{ env.OBS_VERSION }}
         path: |
@@ -261,7 +261,7 @@ jobs:
         if-no-files-found: error
 
     - name: Upload Build Asset Initial Flash
-      uses: actions/upload-artifact@v4
+      uses: actions/upload-artifact@v6
       with:
         name: obs-${{ env.OBS_VERSION }}-initial-flash
         path: |
@@ -274,7 +274,7 @@ jobs:
         if-no-files-found: error
 
     - name: Upload Build Asset obspro
-      uses: actions/upload-artifact@v4
+      uses: actions/upload-artifact@v6
       with:
         name: obspro-${{ env.OBS_VERSION }}
         path: |
@@ -286,7 +286,7 @@ jobs:
         if-no-files-found: error
 
     - name: Upload Build Asset Initial Flash obspro
-      uses: actions/upload-artifact@v4
+      uses: actions/upload-artifact@v6
       with:
         name: obspro-${{ env.OBS_VERSION }}-initial-flash
         path: |