Bump actions/upload-artifact from 3 to 4

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 3 to 4.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v3...v4)

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

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

.github/workflows/main.yml

@@ -209,21 +209,21 @@ jobs:
 
     - name: Upload VST3 (Windows)
       if: ${{ matrix.name == 'Windows' }}
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
         name: ${{ env.ARTIFACT_NAME }}
         path: '${{ env.VST3_PATH }}'
 
     - name: Upload Zip (Linux)
       if: ${{ matrix.name == 'Linux' }}
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
         name: ${{ env.ARTIFACT_NAME }}
         path: '${{ env.ARTIFACTS_PATH }}/${{ env.ARTIFACT_NAME }}.zip'
 
     - name: Upload DMG (macOS)
       if: ${{ matrix.name == 'macOS' }}
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
         name: ${{ env.ARTIFACT_NAME }}
         path: ${{ env.ARTIFACT_NAME }}.zip