Bump actions/upload-artifact from 6 to 7

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 6 to 7.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v6...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/ccpp.yml

@@ -72,7 +72,7 @@ jobs:
       run: git submodule update --init
     - name: build-static
       run: docker build -f docker/Dockerfile --output=. --target=bin .
-    - uses: actions/upload-artifact@v6
+    - uses: actions/upload-artifact@v7
       with:
          name: sipp
          path: ./sipp