[jsonschema] Test on Python 3.15 (#15988)

Author: srittau

lib/ts_utils/py315.py

@@ -11,9 +11,6 @@
     "resampy",
     "shapely",
     "tensorflow",
-    # Depends on referencing, which depends on rpds-py. rpds-py currently uses
-    # PyO3, which rejects Python 3.15.
-    "jsonschema",
     # Depends on matplotlib, which depends on contourpy. contourpy does not
     # provide Python 3.15 wheels yet.
     "seaborn",