[python-fastapi] update h11, httpx to newer versions (#21145)

* update h11 to newer versions

* update httpx to newer version

Author: wing328

modules/openapi-generator/src/main/resources/python-fastapi/requirements.mustache

@@ -11,9 +11,9 @@ fastapi==0.115.2
 graphene==2.1.8
 graphql-core==2.3.2
 graphql-relay==2.0.1
-h11==0.12.0
+h11==0.16.0
 httptools>=0.3.0,<0.7.0
-httpx==0.24.1
+httpx==0.28.1
 idna==3.7
 itsdangerous==1.1.0
 Jinja2==3.1.4

samples/server/petstore/python-fastapi/requirements.txt

@@ -11,9 +11,9 @@ fastapi==0.115.2
 graphene==2.1.8
 graphql-core==2.3.2
 graphql-relay==2.0.1
-h11==0.12.0
+h11==0.16.0
 httptools>=0.3.0,<0.7.0
-httpx==0.24.1
+httpx==0.28.1
 idna==3.7
 itsdangerous==1.1.0
 Jinja2==3.1.4