build(deps): bump actions/upload-artifact from 4 to 7

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 4 to 7.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v4...v7)

---
updated-dependencies:
- dependency-name: actions/upload-artifact
  dependency-version: '7'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/benchmark.yml

@@ -53,7 +53,7 @@ jobs:
           fi
 
       - name: Upload Results
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v7
         with:
           name: benchmark-${{ matrix.name }}
           path: zthread-benchmark/target/benchmark-${{ matrix.name }}.json
@@ -100,7 +100,7 @@ jobs:
           file_pattern: "README.md assets/benchmark_graph.svg zthread-benchmark/charts/* zthread-benchmark/benchmark.md"
 
       - name: Upload Final Report
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v7
         with:
           name: benchmark-report
           path: |

.github/workflows/ci.yml

@@ -34,7 +34,7 @@ jobs:
 
       - name: Upload Coverage Report
         if: matrix.java == '25'
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v7
         with:
           name: coverage-report
           path: '**/target/site/jacoco/'