[Feature Request] Upgrade Jinja2 compatibility

[tai271828]

Description

We are still using Jinja2 v6.x, and the API of Jinjga2 in the later versions.

Possible Solution

Update the API of Jinja2 we are currently using.

Related Issue

If applicable, add link to existing issue also help us know better.
#53 (comment)

[tai271828]

I think we should pin the version of markupsafe used by jinja2 as well.

(rg-cli-pip-sandbox2-kYDtoQuq-py3.9) [^_^]─[~/work-my-projects/pycontw-projects/post-events/data-for-dev] tai271828@syakaro: 220613-15:16:42 9 file 112Kb
$ rg-cli --talks-csv ./talks-list.csv --proposed-talks-csv ./talks-list-proposed.csv --booth-csv ./booth.csv --csv ./reserved-attendees-2020.csv --csv ./individual-attendees-2020.csv --csv ./corporate-attendees-2020.csv --yaml ./general-
plots-en.yaml --package-yaml ./packages.yaml --sponsor-yaml ./sponsors.yaml     
Traceback (most recent call last):                                                                                                                       
  File "/home/tai271828/.cache/pypoetry/virtualenvs/rg-cli-pip-sandbox2-kYDtoQuq-py3.9/bin/rg-cli", line 5, in <module>
    from report_generator.controller.report_generator_cli import main
  File "/home/tai271828/.cache/pypoetry/virtualenvs/rg-cli-pip-sandbox2-kYDtoQuq-py3.9/lib/python3.9/site-packages/report_generator/controller/report_generator_cli.py", line 10, in <module>
    import report_generator.exporter.html as exporter_html
  File "/home/tai271828/.cache/pypoetry/virtualenvs/rg-cli-pip-sandbox2-kYDtoQuq-py3.9/lib/python3.9/site-packages/report_generator/exporter/html.py", line 5, in <module>
    from jinja2 import BaseLoader, Environment, Markup, PackageLoader                                                  
  File "/home/tai271828/.cache/pypoetry/virtualenvs/rg-cli-pip-sandbox2-kYDtoQuq-py3.9/lib/python3.9/site-packages/jinja2/__init__.py", line 33, in <module>
    from jinja2.environment import Environment, Template                                                                     
  File "/home/tai271828/.cache/pypoetry/virtualenvs/rg-cli-pip-sandbox2-kYDtoQuq-py3.9/lib/python3.9/site-packages/jinja2/environment.py", line 15, in <module>
    from jinja2 import nodes                                                                                          
  File "/home/tai271828/.cache/pypoetry/virtualenvs/rg-cli-pip-sandbox2-kYDtoQuq-py3.9/lib/python3.9/site-packages/jinja2/nodes.py", line 19, in <module>
    from jinja2.utils import Markup                                                                                          
  File "/home/tai271828/.cache/pypoetry/virtualenvs/rg-cli-pip-sandbox2-kYDtoQuq-py3.9/lib/python3.9/site-packages/jinja2/utils.py", line 642, in <module>
    from markupsafe import Markup, escape, soft_unicode
ImportError: cannot import name 'soft_unicode' from 'markupsafe' (/home/tai271828/.cache/pypoetry/virtualenvs/rg-cli-pip-sandbox2-kYDtoQuq-py3.9/lib/python3.9/site-packages/markupsafe/__init__.py)