[stubsabot] Bump regex to 2026.1.15

Release: https://pypi.org/pypi/regex/2026.1.15
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@2025.11.3...2026.1.15

Stubsabot analysis of the diff between the two releases:
 - 0 public Python files have been added.
 - 0 files included in typeshed's stubs have been deleted.
 - 2 files included in typeshed's stubs have been modified or renamed: `regex/_main.py`, `regex/_regex_core.py`.
 - Total lines of Python code added: 16.
 - Total lines of Python code deleted: 4.

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Author: stubsabot

stubs/regex/METADATA.toml

@@ -1,2 +1,2 @@
-version = "2025.11.3"
+version = "2026.1.15"
 upstream_repository = "https://github.com/mrabarnett/mrab-regex"