[fix] CI: remove target test.coverage from python's test matrix

The test.coverage cause a lot of failed CI jobs for reasons that cannot be
explained.  As we do not monitor the coverage anyway, it is superfluous to run
this job, especially as it only has a disruptive effect on the CI.

BTW and the CI action upload-artifact@v3 is deprecated [1]

[1] https://github.com/actions/upload-artifact?tab=readme-ov-file#actionsupload-artifact

Related: https://github.com/searxng/searxng/issues/3983
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

.github/workflows/integration.yml

@@ -45,14 +45,6 @@ jobs:
         make V=1 gecko.driver
     - name: Run tests
       run: make V=1 ci.test
-    - name: Test coverage
-      run: make V=1 test.coverage
-    - name: Store coverage result
-      uses: actions/upload-artifact@v3
-      with:
-        name: coverage-${{ matrix.python-version }}
-        path: coverage/
-        retention-days: 60
 
   themes:
     name: Themes