Bump actions/upload-artifact from 5 to 6

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 5 to 6.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](https://github.com/actions/upload-artifact/compare/v5...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/cifuzz.yml

@@ -40,7 +40,7 @@ jobs:
           output-sarif: true
 
       - name: upload crash
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: ${{ matrix.sanitizer }}_artifacts
           path: ./out/artifacts

.github/workflows/docker.yml

@@ -70,7 +70,7 @@ jobs:
       - run: make docker.tar to-file=.cache/image.tar
                   tags=build-${{ github.run_number }}-${{ matrix.dist }}-${{ matrix.arch }}
         working-directory: docker/coturn/
-      - uses: actions/upload-artifact@v5
+      - uses: actions/upload-artifact@v6
         with:
           name: ${{ matrix.dist }}-${{ matrix.arch }}-${{ github.run_number }}
           path: docker/coturn/.cache/image.tar

.github/workflows/mingw.yml

@@ -113,7 +113,7 @@ jobs:
         if: ${{ matrix.BUILD_TYPE == 'Release' }}
 
       - name: Update artifacts
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: coturn_mingw_${{ matrix.os }}
           path: |

.github/workflows/msvc.yml

@@ -157,7 +157,7 @@ jobs:
         if: ${{ matrix.BUILD_TYPE == 'Release' }}
 
       - name: Update artifacts
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: coturn_msvc-${{ matrix.VCPKG_PLATFORM_TOOLSET }}-${{ matrix.CMAKE_GENERATOR_PLATFORM }}-${{ matrix.BUILD_SHARED_LIBS }}
           path: |