Merge pull request #199 from twisted/dependabot/pip/pygments-2.20.0

Bump pygments from 2.18.0 to 2.20.0

Author: cjwatson

requirements_tests.txt

@@ -104,7 +104,7 @@ ptyprocess==0.7.0
     # via pexpect
 pycparser==2.22
     # via cffi
-pygments==2.18.0
+pygments==2.20.0
     # via rich
 pyproject-hooks==1.1.0
     # via build