chore: fix shellcheck warnings

Author: nijel

.github/workflows/test.yml

@@ -44,7 +44,7 @@ jobs:
       with:
         cache-suffix: test
     - name: Install pip dependencies
-      run: uv pip install --system https://github.com/WeblateOrg/weblate/archive/main.zip -e .[test]
+      run: uv pip install --system https://github.com/WeblateOrg/weblate/archive/main.zip -e ".[test]"
     - name: Test with Django
       env:
         CI_DATABASE: postgresql
@@ -53,7 +53,7 @@ jobs:
         DJANGO_SETTINGS_MODULE: wlhosted.settings_test
       run: |
         weblate collectstatic --noinput
-        coverage run `which weblate` test
+        coverage run "$(which weblate)" test
     - uses: codecov/codecov-action@v5
       with:
         token: ${{secrets.CODECOV_TOKEN}}