Revert jsonschema loosening.

jsonschema>=4.18.1 causes $ref resolution errors in some JSON protocols, for reasons I haven't been able to discern.

The api test environment can't reproduce the problem because its Pipfile still pins it to 4.17. But the snapshot tests just do `pip install ../api`, which uses this setup.py file and installs the latest matching jsonschema, so those tests do catch the problem.

As far as I can tell, there is no reason to update jsonschema in this PR. This version constraint may have been loosened accidentally in an earlier commit. So let's just undo it.

api/setup.py

@@ -59,7 +59,8 @@ def get_version():
     f"opentrons-shared-data=={VERSION}",
     "aionotify==0.3.1",
     "anyio>=3.6.1,<4.0.0",
-    "jsonschema>=4.0.0,<5",
+    # todo(mm, 2024-12-14): investigate ref resolution problems caused by jsonschema>=4.18.1.
+    "jsonschema>=3.0.1,<4.18.0",
     "numpy>=1.20.0,<2",
     "pydantic>=2.0.0,<3",
     "pydantic-settings>=2,<3",