build(deps): bump actions/upload-artifact from 5 to 6

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 5 to 6.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](https://github.com/actions/upload-artifact/compare/v5...v6)

---
updated-dependencies:
- dependency-name: actions/upload-artifact
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

.github/workflows/build_binaries.yml

@@ -23,7 +23,7 @@ jobs:
           CGO_ENABLED: 0
         run: make build
       - name: Upload binaries
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: binaries
           path: miniflux-*

.github/workflows/debian_packages.yml

@@ -53,7 +53,7 @@ jobs:
     - name: Build Debian Packages
       run: make debian-packages
     - name: Upload package
-      uses: actions/upload-artifact@v5
+      uses: actions/upload-artifact@v6
       with:
         name: packages
         path: "*.deb"

.github/workflows/rpm_packages.yml

@@ -36,7 +36,7 @@ jobs:
     - name: Build RPM Package
       run: make rpm
     - name: Upload package
-      uses: actions/upload-artifact@v5
+      uses: actions/upload-artifact@v6
       with:
         name: packages
         path: "*.rpm"