Merge pull request #1735 from python-trio/dependabot/pip/regex-2020.9.27

Author: dependabot-preview[bot]

test-requirements.txt

@@ -48,7 +48,7 @@ pyopenssl==19.1.0         # via -r test-requirements.in
 pyparsing==2.4.7          # via packaging
 pytest-cov==2.10.1        # via -r test-requirements.in
 pytest==6.0.2             # via -r test-requirements.in, pytest-cov
-regex==2020.7.14          # via black
+regex==2020.9.27          # via black
 six==1.15.0               # via astroid, cryptography, packaging, pyopenssl
 sniffio==1.1.0            # via -r test-requirements.in
 sortedcontainers==2.2.2   # via -r test-requirements.in