pip: bump regex from 2026.4.4 to 2026.5.9 in the all-pip-dependencies group (#889)

Bumps the all-pip-dependencies group with 1 update:
[regex](https://github.com/mrabarnett/mrab-regex).

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

Author: dependabot[bot]

pip-requirements.txt

@@ -15,5 +15,5 @@
 edk2-pytool-library==0.23.13
 edk2-pytool-extensions==0.31.0
 antlr4-python3-runtime==4.13.2
-regex==2026.4.4
+regex==2026.5.9
 pygount==3.2.0