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/builds.yaml

@@ -68,7 +68,7 @@ jobs:
           meson test -C build --print-errorlogs --no-stdsplit
 
       - name: Upload artifacts
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         if: failure()
         with:
           name: ${{ github.job }}-${{ matrix.buildtype }}-plain-${{ matrix.plain }}
@@ -108,7 +108,7 @@ jobs:
           meson test -C build --print-errorlogs --no-stdsplit
 
       - name: Upload artifacts
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         if: failure()
         with:
           name: ${{ github.job }}-${{ matrix.buildtype }}-plain-${{ matrix.plain }}