[FIX] Matrix Federation send message when multiple users are involved was not working

[MarcosSpessatto]

Proposed changes (including videos or screenshots)

FED-53 FED-61

It also allows us to use the latest version of Synapse.

Issue(s)

Steps to test or reproduce

Further comments

[codecov[bot]]

Codecov Report

Merging #27327 (62d0677) into feat/federation-feat-2 (5a1c531) will decrease coverage by 0.04%. The diff coverage is n/a.

:exclamation: Current head 62d0677 differs from pull request most recent head 69c3d4b. Consider uploading reports for the commit 69c3d4b to get more accurate results

@@                    Coverage Diff                     @@
##           feat/federation-feat-2   #27327      +/-   ##
==========================================================
- Coverage                   43.03%   43.00%   -0.04%     
==========================================================
  Files                         818      814       -4     
  Lines                       17289    17206      -83     
  Branches                     1946     1925      -21     
==========================================================
- Hits                         7441     7400      -41     
+ Misses                       9576     9543      -33     
+ Partials                      272      263       -9     

Flag	Coverage Δ
e2e	43.00% <ø> (-0.04%)	:arrow_down:

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