GMSL 'fix' to not take down the server on bad room state

[kegsay]

Fixes #3629

Pulls in matrix-org/gomatrixserverlib#460

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 49.34%. Comparing base (3197b09) to head (f735d04).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3636      +/-   ##
==========================================
- Coverage   49.38%   49.34%   -0.04%     
==========================================
  Files         524      524              
  Lines       60133    60133              
==========================================
- Hits        29697    29674      -23     
- Misses      26935    26959      +24     
+ Partials     3501     3500       -1     

Flag	Coverage Δ
unittests	49.34% <ø> (-0.04%)	⬇️

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