feat(update): Bump to discourse 3.2.0

[merkata]

Overview

Bump to 3.2.0

Rationale

Fixes canonical/ubuntu.com#13436

Juju Events Changes

n/a

Module Changes

n/a

Library Changes

n/a

Checklist

• [x ] The charm style guide was applied
• [x ] The contributing guide was applied
• [x ] The changes are compliant with ISD054 - Manging Charm Complexity
• [x ] The documentation is generated using src-docs
• [x ] The documentation for charmhub is updated.
• [x ] The PR is tagged with appropriate label (urgent, trivial, complex)

[github-actions]

Test coverage for 6eb1820

Name              Stmts   Miss Branch BrPart  Cover   Missing
-------------------------------------------------------------
src/charm.py        330     30     82     11    90%   177, 185-186, 350->355, 548-550, 555-556, 567-569, 574-575, 587-589, 594-595, 607-609, 634-636, 678->exit, 688->exit, 718-724, 750->exit, 764-765, 775->exit, 789
src/database.py      30      1      8      1    95%   56
-------------------------------------------------------------
TOTAL               360     31     90     12    90%

Static code analysis report

Run started:2024-02-19 12:44:54.109109

Test results:
  No issues identified.

Code scanned:
  Total lines of code: 1986
  Total lines skipped (#nosec): 1
  Total potential issues skipped due to specifically being disabled (e.g., #nosec BXXX): 0

Run metrics:
  Total issues (by severity):
  	Undefined: 0
  	Low: 0
  	Medium: 0
  	High: 0
  Total issues (by confidence):
  	Undefined: 0
  	Low: 0
  	Medium: 0
  	High: 0
Files skipped (0):