Bump canonicalwebteam.discourse from 5.4.3 to 5.4.9

[skatsaounis]

Done

Bump canonicalwebteam.discourse to 5.4.9

QA

• Trying to access http://127.0.0.1:8027/docs/command-reference, an internal error was thrown:

  Traceback (most recent call last):
  File "/usr/local/lib/python3.8/dist-packages/flask/app.py", line 2450, in wsgi_app
    response = self.handle_exception(e)
  File "/usr/local/lib/python3.8/dist-packages/flask/app.py", line 1867, in handle_exception
    reraise(exc_type, exc_value, tb)
  File "/usr/local/lib/python3.8/dist-packages/flask/_compat.py", line 39, in reraise
    raise value
  File "/usr/local/lib/python3.8/dist-packages/flask/app.py", line 2447, in wsgi_app
    response = self.full_dispatch_request()
  File "/usr/local/lib/python3.8/dist-packages/flask/app.py", line 1952, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/usr/local/lib/python3.8/dist-packages/flask/app.py", line 1821, in handle_user_exception
    reraise(exc_type, exc_value, tb)
  File "/usr/local/lib/python3.8/dist-packages/flask/_compat.py", line 39, in reraise
    raise value
  File "/usr/local/lib/python3.8/dist-packages/flask/app.py", line 1950, in full_dispatch_request
    rv = self.dispatch_request()
  File "/usr/local/lib/python3.8/dist-packages/flask/app.py", line 1936, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "/usr/local/lib/python3.8/dist-packages/canonicalwebteam/discourse/app.py", line 183, in document_view
    document = self.parser.parse_topic(topic, docs_version)
  File "/usr/local/lib/python3.8/dist-packages/canonicalwebteam/discourse/parsers/docs.py", line 124, in parse_topic
    sections = self._get_sections(soup)
  File "/usr/local/lib/python3.8/dist-packages/canonicalwebteam/discourse/parsers/base_parser.py", line 450, in _get_sections
    section_soup = self._get_section(soup, heading.text)
  File "/usr/local/lib/python3.8/dist-packages/canonicalwebteam/discourse/parsers/base_parser.py", line 483, in _get_section
    if heading.string is None and heading.a.next == title_text:
  AttributeError: 'NoneType' object has no attribute 'next'

• Bump to include the following change introduced to 5.4.4 and on.
• http://127.0.0.1:8027/docs/command-reference is accessible since error is gone (screenshot included)

Issue / Card

Fixes #637

Screenshots

[webteam-app]

skatsaounis is not a collaborator of the repo

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (cd64d3d) 83.78% compared to head (0555ca4) 83.78%. Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #641 +/- ## ======================================= Coverage 83.78% 83.78% ======================================= Files 2 2 Lines 74 74 ======================================= Hits 62 62 Misses 12 12 ``` | [Flag](https://app.codecov.io/gh/canonical/microk8s.io/pull/641/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=canonical) | Coverage Δ | | |---|---|---| | [python](https://app.codecov.io/gh/canonical/microk8s.io/pull/641/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=canonical) | `83.78% <ø> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=canonical#carryforward-flags-in-the-pull-request-comment) to find out more.

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