remove starlette from dependencies and bump fastapi (#151)

Author: Buuntu

{{cookiecutter.project_slug}}/backend/requirements.txt

@@ -1,6 +1,6 @@
 alembic==1.4.3
 Authlib==0.14.3
-fastapi==0.61.1
+fastapi==0.63.0
 celery==5.0.0
 redis==3.5.3
 httpx==0.15.5
@@ -11,7 +11,6 @@ psycopg2==2.8.6
 pytest==6.1.0
 requests==2.24.0
 SQLAlchemy==1.3.19
-starlette==0.13.8
 uvicorn==0.12.1
 passlib==1.7.2
 bcrypt==3.2.0