Remove ujson dependency

- Update default_response_class to ORJSONResponse.
- Remove the ujson dependency as it's deprecated.
- Remove install [all] with fastapi
- Explicitly add dependency packages for Pydantic and Starlette
- Update FastAPI to latest version 0.75.0
- Lock stomp.py to 7.0.0 as 8.0.0 broke the app

This fixes ujson CVE-2021-45958.

This is related to:
tiangolo/fastapi#820

Signed-off-by: Wayne Sun <gsun@redhat.com>

Pipfile

@@ -17,10 +17,15 @@ aioredis = "*"
 aiofile = "*"
 pytest = "*"
 pytest-dotenv = "*"
-"stomp.py" = "*"
+"stomp.py" = "==7.0.0"
 irc = "*"
 werkzeug = "*"
-fastapi = {version = "==0.73.0", extras = ["all"]}
+fastapi = "==0.75.0"
+email-validator = "*"
+jinja2 = "*"
+python-multipart = "*"
+pyyaml = "*"
+orjson = "*"
 
 [dev-packages]