feat(sdk): add Python 3.14 support

- Extend SDK metadata and CI matrices
- Refresh dependencies and compatibility fixtures
- Add regression coverage and changelog fragment

tests/conftest.py

@@ -0,0 +1,4 @@
+from freezegun import configure
+
+# Skip lazy Okta imports building Pydantic schemas against frozen datetime.
+configure(extend_ignore_list=["okta"])