Bump actions/upload-artifact from 3 to 5

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 3 to 5.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](https://github.com/actions/upload-artifact/compare/v3...v5)

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

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

.github/workflows/benchmark.yml

@@ -36,7 +36,7 @@ jobs:
         run: cargo bench --no-fail-fast
 
       - name: Upload benchmark results
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v5
         with:
           name: benchmark-results
           path: target/criterion/

.github/workflows/ci.yml

@@ -149,7 +149,7 @@ jobs:
         run: cargo build --release --target ${{ matrix.target }} --verbose
 
       - name: Upload artifact
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v5
         with:
           name: piglet-${{ matrix.target }}
           path: target/${{ matrix.target }}/release/piglet