Update dependency Jinja2 to v3

* MythX CLI version: 0.6.22
* Python version: 3.8
* Operating System: GitHub Workflow

### Description

Describe what you were trying to get done.
Tell us what happened, what went wrong, and what you expected to happen.
I'm using mythx-cli in GitHub workflow. But pip-cli is upgraded from 21 to 22, it doesn't work.
The reason is jinja2 is old.
Please check this.
https://github.com/pallets/jinja/issues/1585

### What I Did

```
Run mythx --api-key *** \
Traceback (most recent call last):
File "/opt/hostedtoolcache/Python/3.8.12/x64/bin/mythx", line 5, in
from mythx_cli.cli import cli
File "/opt/hostedtoolcache/Python/3.8.12/x64/lib/python3.8/site-packages/mythx_cli/cli.py", line 21, in
from mythx_cli.render.command import render
File "/opt/hostedtoolcache/Python/3.8.12/x64/lib/python3.8/site-packages/mythx_cli/render/command.py", line 7, in
import jinja2
File "/opt/hostedtoolcache/Python/3.8.12/x64/lib/python3.8/site-packages/jinja2/__init__.py", line 12, in
from .environment import Environment
File "/opt/hostedtoolcache/Python/3.8.12/x64/lib/python3.8/site-packages/jinja2/environment.py", line 25, in
from .defaults import BLOCK_END_STRING
File "/opt/hostedtoolcache/Python/3.8.12/x64/lib/python3.8/site-packages/jinja2/defaults.py", line 3, in
from .filters import FILTERS as DEFAULT_FILTERS # noqa: F[40](https://github.com/upstateinteractive/perfectpool-dao/runs/5543485952?check_suite_focus=true#step:8:40)1
File "/opt/hostedtoolcache/Python/3.8.12/x64/lib/python3.8/site-packages/jinja2/filters.py", line 13, in
from markupsafe import soft_unicode
ImportError: cannot import name 'soft_unicode' from 'markupsafe' (/opt/hostedtoolcache/Python/3.8.12/x64/lib/python3.8/site-packages/markupsafe/__init__.py)
Error: Process completed with exit code 1.
```

No dependency file or test path is named. Start by locating the project's dependency declarations and reproduce the Python 3.8 GitHub Workflow failure; done means Jinja2 v3 is compatible and mythx starts without the soft_unicode ImportError.

Written by the indexing model from the issue text.