Import `GenerateJsonSchema from fastapi._compat.v2`

where it is modified since
https://github.com/fastapi/fastapi/commit/e8b98d21871f64234520c1e770f39e6bfea3b0d5#diff-1086603fdd56511aafd1d279396b142b803e48164327148e6de26cef4cdaed81

lib/galaxy/schema/generics.py

@@ -6,7 +6,6 @@ from typing import (
 )
 
 from pydantic import BaseModel
-from pydantic.json_schema import GenerateJsonSchema
 from typing_extensions import override
 
 from galaxy.schema.fields import (
@@ -42,17 +41,6 @@ class GenericModel(BaseModel):
         return suffix
 
 
-class CustomJsonSchema(GenerateJsonSchema):
-    def get_defs_ref(self, core_mode_ref):
-        full_def = super().get_defs_ref(core_mode_ref)
-        choices = self._prioritized_defsref_choices[full_def]
-        ref, mode = core_mode_ref
-        if ref in ref_to_name:
-            for i, choice in enumerate(choices):
-                choices[i] = choice.replace(choices[0], ref_to_name[ref])  # type: ignore[call-overload]
-        return full_def
-
-
 class PatchGenericPickle:
     """A mixin that allows generic pydantic models to be serialized and deserialized with pickle.
 

lib/galaxy/webapps/galaxy/fast_app.py

@@ -1,5 +1,6 @@
 from typing import (
     Any,
+    TYPE_CHECKING,
 )
 from urllib.parse import urljoin
 
@@ -18,7 +19,7 @@ from slowapi.util import get_remote_address
 from starlette.middleware.cors import CORSMiddleware
 from tuspyserver import create_tus_router
 
-from galaxy.schema.generics import CustomJsonSchema
+from galaxy.schema.generics import ref_to_name
 from galaxy.version import VERSION
 from galaxy.webapps.base.api import (
     add_exception_handler,
@@ -28,8 +29,15 @@ from galaxy.webapps.base.api import (
     include_all_package_routers,
 )
 from galaxy.webapps.base.webapp import config_allows_origin
+from galaxy.webapps.openapi._compat.v2 import GenerateJsonSchema
 from galaxy.webapps.openapi.utils import get_openapi
 
+if TYPE_CHECKING:
+    from pydantic.json_schema import (
+        CoreModeRef,
+        DefsRef,
+    )
+
 # https://fastapi.tiangolo.com/tutorial/metadata/#metadata-for-tags
 api_tags_metadata = [
     {
@@ -164,6 +172,17 @@ def get_fastapi_instance(root_path="") -> FastAPI:
     )
 
 
+class CustomJsonSchema(GenerateJsonSchema):
+    def get_defs_ref(self, core_mode_ref: "CoreModeRef") -> "DefsRef":
+        full_def = super().get_defs_ref(core_mode_ref)
+        choices = self._prioritized_defsref_choices[full_def]
+        ref, mode = core_mode_ref
+        if ref in ref_to_name:
+            for i, choice in enumerate(choices):
+                choices[i] = choice.replace(choices[0], ref_to_name[ref])  # type: ignore[call-overload]
+        return full_def
+
+
 def get_openapi_schema() -> dict[str, Any]:
     """
     Dumps openAPI schema without starting a full app and webserver.

lib/galaxy/webapps/openapi/_compat/v2.py

@@ -8,6 +8,7 @@ from typing import (
 
 from fastapi._compat.v2 import (
     _has_computed_fields,
+    GenerateJsonSchema as GenerateJsonSchema,
     get_flat_models_from_fields,
     ModelField,
 )
@@ -15,7 +16,6 @@ from fastapi.openapi.constants import REF_TEMPLATE
 from fastapi.types import ModelNameMap
 from pydantic.fields import FieldInfo as FieldInfo
 from pydantic.json_schema import (
-    GenerateJsonSchema as GenerateJsonSchema,
     JsonSchemaValue as JsonSchemaValue,
 )
 

lib/galaxy/webapps/openapi/utils.py

@@ -31,10 +31,10 @@ from fastapi.openapi.utils import (
     get_fields_from_routes,
     get_openapi_path,
 )
-from pydantic.json_schema import GenerateJsonSchema
 from starlette.routing import BaseRoute
 
 from ._compat import get_definitions
+from ._compat.v2 import GenerateJsonSchema
 
 
 def get_openapi(