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](actions/upload-artifact@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] <[email protected]>

Author: dependabot[bot]

.github/workflows/test.yml

@@ -155,7 +155,7 @@ jobs:
         ./venv/bin/coverage xml -o coverage.xml
 
     - name: Save coverage
-      uses: actions/upload-artifact@v5
+      uses: actions/upload-artifact@v6
       with:
         name: coverage_${{ matrix.os }}_${{ matrix.tests-env }}
         path: coverage.xml
@@ -244,7 +244,7 @@ jobs:
               cp ./dpkg/*.deb /home/runner/work/Geotrek-admin/
 
           - name: Archive package artifact
-            uses: actions/upload-artifact@v5
+            uses: actions/upload-artifact@v6
             with:
               name: ${{ matrix.os }}
               path: |
@@ -325,7 +325,7 @@ jobs:
         continue-on-error: false
 
       - name: Archive results as artifacts
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: cypress-docker
           path: |
@@ -414,7 +414,7 @@ jobs:
         continue-on-error: false
 
       - name: Archive results as artifacts
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: cypress-${{ matrix.code }}
           path: |