pythonPackages: deprecate pytestcov alias

pkgs/development/python-modules/python-language-server/default.nix

@@ -1,6 +1,6 @@
 { lib, buildPythonPackage, fetchFromGitHub, pythonAtLeast, pythonOlder, isPy27
 , backports_functools_lru_cache ? null, configparser ? null, futures ? null, future, jedi, pluggy, python-jsonrpc-server, flake8
-, pytestCheckHook, mock, pytestcov, coverage, setuptools, ujson, flaky
+, pytestCheckHook, mock, pytest-cov, coverage, setuptools, ujson, flaky
 , # Allow building a limited set of providers, e.g. ["pycodestyle"].
   providers ? ["*"]
   # The following packages are optional and
@@ -55,7 +55,7 @@ buildPythonPackage rec {
   doCheck = providers == ["*"];
 
   checkInputs = [
-    pytestCheckHook mock pytestcov coverage flaky
+    pytestCheckHook mock pytest-cov coverage flaky
     # Do not propagate flake8 or it will enable pyflakes implicitly
     flake8
     # rope is technically a dependency, but we don't add it by default since we