ci: migrate to uv! (#4698)

* Migrate to `uv`
* Format `pyproject.toml` files properly
* Remove upper bounds on dependencies, and bounds on dev dependencies
(we should be using latest)
* Move to hatch for packaing

In the future we should:
* Set up dependabot / automate lockfile updates and tests
* Add tests for min compatible versions (I'll do this right after merge)
* Use dynamic versioning
* Bump `pydantic` to v2.11.4 in the lockfile, we have some tests failing

libs/checkpoint-sqlite/langgraph/checkpoint/sqlite/utils.py

@@ -1,5 +1,6 @@
 import json
-from typing import Any, Dict, Optional, Sequence, Tuple
+from collections.abc import Sequence
+from typing import Any, Optional
 
 from langchain_core.runnables import RunnableConfig
 
@@ -7,8 +8,8 @@ from langgraph.checkpoint.base import get_checkpoint_id
 
 
 def _metadata_predicate(
-    metadata_filter: Dict[str, Any],
-) -> Tuple[Sequence[str], Sequence[Any]]:
+    metadata_filter: dict[str, Any],
+) -> tuple[Sequence[str], Sequence[Any]]:
     """Return WHERE clause predicates for (a)search() given metadata filter.
 
     This method returns a tuple of a string and a tuple of values. The string
@@ -17,7 +18,7 @@ def _metadata_predicate(
     for each of the corresponding parameters.
     """
 
-    def _where_value(query_value: Any) -> Tuple[str, Any]:
+    def _where_value(query_value: Any) -> tuple[str, Any]:
         """Return tuple of operator and value for WHERE clause predicate."""
         if query_value is None:
             return ("IS ?", None)
@@ -52,9 +53,9 @@ def _metadata_predicate(
 
 def search_where(
     config: Optional[RunnableConfig],
-    filter: Optional[Dict[str, Any]],
+    filter: Optional[dict[str, Any]],
     before: Optional[RunnableConfig] = None,
-) -> Tuple[str, Sequence[Any]]:
+) -> tuple[str, Sequence[Any]]:
     """Return WHERE clause predicates for (a)search() given metadata filter
     and `before` config.