Bump Flask=1.1.2 to Flask==2.2.2

[msris108]

• Jinja is a dependency of Flask and Flask V1.X.X uses the escape module from Jinja, however recently support for the escape module was dropped in newer versions of Jinja.

• To fix this issue, simply update to the newer version of Flask V2.X.X in your requirements.txt where Flask no longer uses the escape module from Jinja.

Simple fix: bump Flask=1.1.2 to Flask==2.2.2

Traceback (most recent call last):
  File "C:\Users\srim2\Documents\Personal\projects\prometheus-data-generator\prometheus_data_generator\main.py", line 9, in <module>
    from flask import Flask, Response
  File "C:\Users\srim2\Anaconda3\lib\site-packages\flask\__init__.py", line 14, in <module>
    from jinja2 import escape
ImportError: cannot import name 'escape' from 'jinja2' (C:\Users\srim2\Anaconda3\lib\site-packages\jinja2\__init__.py)