chore(deps): bump regex from 2025.11.3 to 2026.1.15 in /hack/api-docs (#5844)

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

hack/api-docs/requirements.txt

@@ -31,7 +31,7 @@ pymdown-extensions==10.20
 python-dateutil==2.9.0.post0
 PyYAML==6.0.3
 pyyaml_env_tag==1.1
-regex==2025.11.3
+regex==2026.1.15
 requests==2.32.5
 six==1.17.0
 termcolor==3.3.0