Replace setup.py instructions with uv in conftest.py and CONTRIBUTING.rst

Address review feedback: replace deprecated 'python setup.py build_ext
--inplace' instructions with 'uv sync --reinstall-package scylla-driver'
and note that 'uv run pytest' handles rebuilds automatically via
cache-keys in pyproject.toml.

Author: mykaul

CONTRIBUTING.rst

@@ -42,9 +42,12 @@ down to about 2-3 seconds.
 
 **Important:** After modifying any ``.py`` file under ``cassandra/`` that is
 Cython-compiled (such as ``query.py``, ``protocol.py``, ``cluster.py``, etc.),
-you **must** rebuild extensions before running tests::
+extensions must be rebuilt before running tests. If you always use ``uv run``
+(e.g. ``uv run pytest``), this is handled automatically via the ``cache-keys``
+configuration in ``pyproject.toml``. If you invoke ``pytest`` directly, you can
+rebuild with::
 
-    python setup.py build_ext --inplace
+    uv sync --reinstall-package scylla-driver
 
 Without rebuilding, Python will load the stale compiled extension (``.so`` / ``.pyd``)
 instead of your modified ``.py`` source, and your changes will not actually be tested.

tests/conftest.py

@@ -25,7 +25,7 @@ def pytest_configure(config):
 
     Python's import system prefers compiled extensions (.so / .pyd) over pure
     Python (.py) files.  If a developer edits a .py file without rebuilding
-    the Cython extensions (``python setup.py build_ext --inplace``), the tests
+    the Cython extensions, the tests
     will silently run the *old* compiled code, masking any regressions in the
     Python source.
 
@@ -61,6 +61,7 @@ def pytest_configure(config):
             f"Stale Cython extension(s) detected: {names}. "
             f"The .py source is newer than the compiled extension — tests "
             f"will run the OLD compiled code, not your latest changes. "
-            f"Rebuild with:  python setup.py build_ext --inplace",
+            f"Rebuild with:  uv sync --reinstall-package scylla-driver\n"
+            f"Or use 'uv run pytest' which handles rebuilds automatically.",
             stacklevel=1,
         )