feat: adding cursory Python 3.14 support (#6298)

* catching error thrown by asyncio
* using 2nd check for annotations given Pydantic 2.12 changes
* skipping tests for remote graph bc langgraph-api is dependent on
`jsonschema-rs`
* skipping tests w/ pydantic v1 models

```bash
hint: This usually indicates a problem with the package or the build environment.
  help: `jsonschema-rs` (v0.29.1) was included because `langgraph:dev` (v1.0.0rc1) depends on `langgraph-cli[inmem]` which
        depends on `langgraph-api` (v0.4.29) which depends on `jsonschema-rs`
```

not yet testing for free threaded python, that'll be much more involved!

ended up separating lint / testing deps during this process bc I was
getting a ton of not required deps while testing that were complicating
things :/

libs/prebuilt/tests/test_react_agent.py

@@ -1,6 +1,7 @@
 import dataclasses
 import inspect
 import json
+import sys
 from functools import partial
 from typing import (
     Annotated,
@@ -678,7 +679,13 @@ T = TypeVar("T")
     "schema_",
     [
         _InjectStateSchema,
-        _InjectedStatePydanticSchema,
+        pytest.param(
+            _InjectedStatePydanticSchema,
+            marks=pytest.mark.skipif(
+                sys.version_info >= (3, 14),
+                reason="Pydantic v1 not supported in Python 3.14+",
+            ),
+        ),
         _InjectedStatePydanticV2Schema,
         _InjectedStateDataclassSchema,
     ],