python310Packages.apache-beam: Add missing test dependency

pkgs/development/python-modules/apache-beam/default.nix

···
 , sqlalchemy
 , tenacity
 , typing-extensions
-, scikit-learn
-}:
+, testcontainers
+, scikit-learn }:
 
 buildPythonPackage rec {
   pname = "apache-beam";
···
     scikit-learn
     sqlalchemy
     tenacity
+    testcontainers
   ];
 
   # Make sure we're running the tests for the actually installed
···
     #         container_init: Callable[[], Union[PostgresContainer, MySqlContainer]],
     #     E   NameError: name 'MySqlContainer' is not defined
     #
-    # Test relies on the testcontainers package, which is not currently (as of
-    # 2022-04-08) available in nixpkgs.
     "apache_beam/io/external/xlang_jdbcio_it_test.py"
 
     # These tests depend on the availability of specific servers backends.

pkgs/development/python-modules/testcontainers/default.nix

···
 , buildPythonPackage
 , deprecation
 , docker
-, wrapt
-}:
+, wrapt }:
 
 buildPythonPackage rec {
   pname = "testcontainers";
···
   ];
 
   meta = with lib; {
-    description = "Allows using docker containers for functional and integration testing";
+    description = ''
+      Allows using docker containers for functional and integration testing
+    '';
     homepage = "https://github.com/testcontainers/testcontainers-python";
     license = licenses.asl20;
     maintainers = with maintainers; [ onny ];