Python 3.9 compatibility changes; pre-commit updates

Author: wdoppenberg

python-sdk/.pre-commit-config.yaml

@@ -1,6 +1,6 @@
 repos:
   - repo: https://github.com/charliermarsh/ruff-pre-commit
-    rev: v0.11.8
+    rev: v0.12.9
     hooks:
       - id: ruff
         args: [
@@ -10,12 +10,12 @@ repos:
       - id: ruff-format
         files: ^python-sdk/
   - repo: https://github.com/pre-commit/mirrors-mypy
-    rev: v1.15.0
+    rev: v1.17.1
     hooks:
       - id: mypy
         files: ^python-sdk/
         args: [
-          --python-version=3.12,
+          --python-version=3.9,
           --disallow-untyped-calls,
           --disallow-untyped-defs,
           --disallow-incomplete-defs,

python-sdk/ag_ui/encoder/encoder.py

@@ -2,6 +2,8 @@
 This module contains the EventEncoder class
 """
 
+from typing import Union
+
 from ag_ui.core.events import BaseEvent
 
 AGUI_MEDIA_TYPE = "application/vnd.ag-ui.event+proto"
@@ -12,7 +14,7 @@ class EventEncoder:
     Encodes Agent User Interaction events.
     """
 
-    def __init__(self, accept: str | None = None):
+    def __init__(self, accept: Union[str, None] = None):
         pass
 
     def get_content_type(self) -> str: