Remove sphinx-testing dependency and update import

Eliminated the installation of sphinx-testing from the CI workflow and replaced its path import in tests/conftest.py with the standard os.path module.

Author: douden

.github/workflows/ci.yml

@@ -36,7 +36,6 @@ jobs:
         run : |
           python -m pip install --upgrade pip
           pip install -e.[testing]
-          pip install sphinx-testing
       - name: Run pytest
         run: |
           pytest --durations=10 --cov=sphinx_proof --cov-report=xml --cov-report=term-missing

tests/conftest.py

@@ -1,7 +1,7 @@
 import shutil
 import pytest
 
-from sphinx.testing.path import path
+from os import path
 
 pytest_plugins = "sphinx.testing.fixtures"