pip: bump regex from 2025.9.1 to 2025.9.18 (#1513)

Bumps [regex](https://github.com/mrabarnett/mrab-regex) from 2025.9.1 to
2025.9.18.

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

pip-requirements.txt

@@ -18,4 +18,4 @@ antlr4-python3-runtime==4.13.2
 lcov-cobertura==2.1.1
 pygount==3.1.0 # MU_CHANGE
 toml==0.10.2 # MU_CHANGE
-regex==2025.9.1
+regex==2025.9.18