Merge pull request #1768 from python-trio/dependabot/pip/regex-2020.10.23

Author: dependabot-preview[bot]

test-requirements.txt

@@ -47,7 +47,7 @@ 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==6.1.1             # via -r test-requirements.in, pytest-cov
-regex==2020.10.15         # via black
+regex==2020.10.23         # via black
 six==1.15.0               # via astroid, cryptography, packaging, pyopenssl
 sniffio==1.2.0            # via -r test-requirements.in
 sortedcontainers==2.2.2   # via -r test-requirements.in