chore: Update to latest Ruma version

[Hywan]

Extracted from #4531.

This patch updates ruma to the latest commit at the time of writing.

I'm really not sure about what I'm doing, so please be careful during the review 😛.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.42%. Comparing base (9641aa9) to head (7c6a592).
Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4532      +/-   ##
==========================================
- Coverage   85.43%   85.42%   -0.02%     
==========================================
  Files         285      285              
  Lines       32105    32064      -41     
==========================================
- Hits        27429    27390      -39     
+ Misses       4676     4674       -2     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[poljar]

This patch updates ruma to the latest commit at the time of writing.

Latest commit on the stable branch of Ruma or on the main branch? The main branch won't see a release in the next 6ish months.

The Ruma folks very nicely provide a stable branch on which they backport non-breaking changes: https://github.com/ruma/ruma/tree/ruma-0.12.

What exactly do you need from the Ruma bump?

[richvdh]

I feel like this probably wants a changelog entry or two, assuming that the ruma changes result in some externally-visible change?