Bump actions/download-artifact from 4 to 5

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 4 to 5.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](https://github.com/actions/download-artifact/compare/v4...v5)

---
updated-dependencies:
- dependency-name: actions/download-artifact
  dependency-version: '5'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

.github/workflows/gradle.yaml

@@ -158,7 +158,7 @@ jobs:
         with:
           submodules: recursive
 
-      - uses: actions/download-artifact@v4
+      - uses: actions/download-artifact@v5
         with:
           name: 'SlimeVR-Server'
           path: server/desktop/build/libs/
@@ -256,7 +256,7 @@ jobs:
         with:
           submodules: recursive
 
-      - uses: actions/download-artifact@v4
+      - uses: actions/download-artifact@v5
         with:
           name: 'SlimeVR-Server'
           path: server/desktop/build/libs/
@@ -336,7 +336,7 @@ jobs:
         with:
           submodules: recursive
 
-      - uses: actions/download-artifact@v4
+      - uses: actions/download-artifact@v5
         with:
           name: 'SlimeVR-Server'
           path: server/desktop/build/libs/