build(deps): bump actions/upload-artifact from 5 to 7

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 5 to 7.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v5...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/build.yml

@@ -304,7 +304,7 @@ jobs:
           bash start_build.sh --log-to-stdout --mingw64 --geany-plugins --geany-plugins-source "${{ github.workspace }}"
 
       - name: Archive Geany-Plugins Installer
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v7
         with:
           name: geany-plugins-installer-ci-${{ env.SHORT_SHA }}-pr${{ env.GITHUB_PULL_REQUEST_OR_REF }}
           retention-days: 30

.github/workflows/windows-msys2-build.yml

@@ -78,7 +78,7 @@ jobs:
           python build/msys2-geany-plugins-release.py ${VERSION}
       - name: Upload Unsigned Artifact
         id: upload-unsigned-artifact
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v7
         with:
           name: geany-plugins-unsigned
           path: geany_build/*.exe