Let the package managers handle dependencies, m'kay?

--- a/conftest.py
+++ b/conftest.py
@@ -7,27 +7,6 @@
 import pytest
 from ansible.module_utils.common.yaml import HAS_LIBYAML
 
-# checking if user is running pytest without installing test dependencies:
-missing = []
-for module in ["ansible", "black", "flake8", "flaky", "mypy", "pylint"]:
-    if not importlib.util.find_spec(module):
-        missing.append(module)
-if missing:
-    print(
-        f"FATAL: Missing modules: {', '.join(missing)} -- probably you missed installing test requirements with: pip install -e '.[test]'",
-        file=sys.stderr,
-    )
-    sys.exit(1)
-
-if not HAS_LIBYAML:
-    # While presence of libyaml is not required for runtime, we keep this error
-    # fatal here in order to be sure that we spot libyaml errors during testing.
-    print(
-        "FATAL: For testing, we require pyyaml to be installed with its native extension, missing it would make testing 3x slower and risk missing essential bugs.",
-        file=sys.stderr,
-    )
-    sys.exit(1)
-
 
 os.environ["NO_COLOR"] = "1"