[stubsabot] Bump Pygments to 2.20.*

Release: https://pypi.org/pypi/Pygments/2.20.0
Homepage: https://pygments.org
Repository: https://github.com/pygments/pygments
Typeshed stubs: https://github.com/python/typeshed/tree/main/stubs/Pygments
Changelog: https://github.com/pygments/pygments/blob/master/CHANGES
Diff: pygments/pygments@2.19.2...2.20.0

Stubsabot analysis of the diff between the two releases:
 - 1 public Python file has been added: `pygments/lexers/rell.py`.
 - 0 files included in typeshed's stubs have been deleted.
 - 31 files included in typeshed's stubs have been modified or renamed.
 - Total lines of Python code added: 1328.
 - Total lines of Python code deleted: 655.

If stubtest fails for this PR:
- Leave this PR open (as a reminder, and to prevent stubsabot from opening another PR)
- Fix stubtest failures in another PR, then close this PR

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Author: stubsabot

stubs/Pygments/METADATA.toml

@@ -1,4 +1,4 @@
-version = "2.19.*"
+version = "2.20.*"
 upstream_repository = "https://github.com/pygments/pygments"
 dependencies = ["types-docutils"]
 partial_stub = true