Bump requirements
MODIFY
dev-requirements.txt
dev-requirements.txt
-coverage==5.5
+coverage==6.0
tornado==6.1
PySocks==1.7.1
-pytest==6.2.4
+pytest==6.2.5
pytest-timeout==1.4.2
pytest-freezegun==0.4.2
flaky==3.7.0
trustme==0.9.0
-cryptography==3.4.7
+cryptography==35.0.0
backports.zoneinfo==0.2.1;python_version<"3.9"
# https://github.com/twisted/towncrier/pull/356
git+https://github.com/twisted/towncrier.git

Bump requirements (#2442)