Remove no-longer-needed keyring dependency

Author: adamtheturtle

pyproject.toml

@@ -286,7 +286,6 @@ dev = [
     "enum-tools[sphinx]==0.9.0.post1",
     "freezegun==1.2.2",
     "furo==2023.3.23",
-    "keyring==23.13.1",
     "mypy==1.1.1",
     "pdm==2.4.9",
     "pip_check_reqs==2.4.4",