[stubsabot] Bump regex to 2025.7.31

Release: https://pypi.org/pypi/regex/2025.7.31
Homepage: https://github.com/mrabarnett/mrab-regex
Repository: https://github.com/mrabarnett/mrab-regex
Typeshed stubs: https://github.com/python/typeshed/tree/main/stubs/regex
Diff: mrabarnett/mrab-regex@2024.11.6...2025.7.31

Stubsabot analysis of the diff between the two releases:
 - Total lines of Python code added: 55.
 - Total lines of Python code deleted: 39.

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Author: stubsabot

stubs/regex/METADATA.toml

@@ -1,2 +1,2 @@
-version = "2024.11.6"
+version = "2025.7.31"
 upstream_repository = "https://github.com/mrabarnett/mrab-regex"