Merge pull request #2486 from python-trio/dependabot/pip/cryptography-38.0.4

Bump cryptography from 38.0.2 to 38.0.4

Author: pquentin

test-requirements.txt

@@ -25,7 +25,7 @@ click==8.1.3
     # via black
 coverage[toml]==6.4.1
     # via pytest-cov
-cryptography==38.0.2
+cryptography==38.0.4
     # via
     #   -r test-requirements.in
     #   pyopenssl