flake8-requirements is listed in requirements-dev.txt but not selected

[loqs]

When selected several issues are detected:

flake8 --select "I9" aiosmtpd
aiosmtpd/controller.py:24:1: I900 'public' not listed as a requirement
aiosmtpd/docs/_exts/autoprogramm.py:38:1: I900 'docutils' not listed as a requirement
aiosmtpd/docs/_exts/autoprogramm.py:39:1: I900 'docutils' not listed as a requirement
aiosmtpd/docs/_exts/autoprogramm.py:40:1: I900 'docutils' not listed as a requirement
aiosmtpd/docs/_exts/autoprogramm.py:41:1: I900 'docutils' not listed as a requirement
aiosmtpd/docs/conf.py:25:5: I900 'colorama' not listed as a requirement
aiosmtpd/handlers.py:25:1: I900 'public' not listed as a requirement
aiosmtpd/lmtp.py:4:1: I900 'public' not listed as a requirement
aiosmtpd/main.py:16:1: I900 'public' not listed as a requirement
aiosmtpd/proxy_protocol.py:15:1: I900 'public' not listed as a requirement
aiosmtpd/qa/test_0packaging.py:15:1: I900 'packaging' not listed as a requirement
aiosmtpd/smtp.py:37:1: I900 'public' not listed as a requirement
aiosmtpd/tests/test_handlers.py:30:5: I900 'typing_extensions' not listed as a requiremen