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/ci.yml

@@ -224,7 +224,7 @@ jobs:
 
       - name: Upload coverage artifact
         if: matrix.python != '3.14'
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v7
         with:
           name: coverage-ubuntu-${{ matrix.ubuntu }}-py${{ matrix.python }}
           path: |
@@ -481,7 +481,7 @@ jobs:
           echo "[check] all install validations passed"
 
       - name: Upload .deb artifact
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v7
         with:
           name: docking-deb
           path: artifacts/docking_*.deb
@@ -508,7 +508,7 @@ jobs:
           ./packaging/rpm/build.sh
 
       - name: Upload RPM artifact
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v7
         with:
           name: docking-rpm
           path: artifacts/*.rpm
@@ -539,7 +539,7 @@ jobs:
           ls -lh artifacts/org.docking.Docking.flatpak
 
       - name: Upload Flatpak artifact
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v7
         with:
           name: docking-flatpak
           path: artifacts/org.docking.Docking.flatpak
@@ -571,7 +571,7 @@ jobs:
           ls -lh artifacts/*.snap
 
       - name: Upload Snap artifact
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v7
         with:
           name: docking-snap
           path: artifacts/*.snap
@@ -600,7 +600,7 @@ jobs:
           ./packaging/appimage/build.sh
 
       - name: Upload AppImage artifact
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v7
         with:
           name: docking-appimage
           path: artifacts/*.AppImage
@@ -632,7 +632,7 @@ jobs:
           ls -lh artifacts/*.pkg.tar.*
 
       - name: Upload Arch artifact
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v7
         with:
           name: docking-arch
           path: artifacts/*.pkg.tar.*
@@ -664,7 +664,7 @@ jobs:
           ./packaging/nix/build.sh
 
       - name: Upload Nix artifact
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v7
         with:
           name: docking-nix
           path: |