Drop 3.9 in CI and add 3.13

Author: bryantpark04

.circleci/config.yml

@@ -113,7 +113,7 @@ workflows:
           name: python-<< matrix.python_version>>
           matrix:
             parameters:
-              python_version: ["3.9", "3.10", "3.11", "3.12", "3.14"]
+              python_version: ["3.10", "3.11", "3.12", "3.13", "3.14"]
               pydantic_version: ["2.12"]
               httpx_version: ["0.28"]
       - test:
@@ -137,10 +137,10 @@ workflows:
       - circle-all:
           <<: *always-run
           requires:
-            - python-3.9
             - python-3.10
             - python-3.11
             - python-3.12
+            - python-3.13
             - python-3.14
 
             - pydantic-2.6