fix: Add is_requester_admin parameter to upgrade room callback

[nico-famedly]

This is for consistency with the room create API.

[jason-famedly]

Ignoring Complement and Sytest flakes, I'm happy if CI passes

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 2 lines in your changes missing coverage. Please review.

Project coverage is 78.66%. Comparing base (faa7659) to head (420d831).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
synapse/handlers/room.py	50.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #21      +/-   ##
==========================================
- Coverage   78.66%   78.66%   -0.01%     
==========================================
  Files         472      472              
  Lines       67488    67491       +3     
  Branches    10367    10368       +1     
==========================================
+ Hits        53091    53092       +1     
- Misses      10893    10894       +1     
- Partials     3504     3505       +1     

Files with missing lines	Coverage Δ
...api/callbacks/third_party_event_rules_callbacks.py	67.68% <100.00%> (ø)
synapse/handlers/room.py	74.38% <50.00%> (-0.21%)	⬇️

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