update fastapi to newer version

Author: wing328

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

@@ -7,7 +7,7 @@ chardet==4.0.0
 click==7.1.2
 dnspython==2.6.1
 email-validator==2.0.0
-fastapi==0.115.2
+fastapi==0.120.1
 graphene==2.1.8
 graphql-core==2.3.2
 graphql-relay==2.0.1

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

@@ -7,7 +7,7 @@ chardet==4.0.0
 click==7.1.2
 dnspython==2.6.1
 email-validator==2.0.0
-fastapi==0.115.2
+fastapi==0.120.1
 graphene==2.1.8
 graphql-core==2.3.2
 graphql-relay==2.0.1