fix(experimental-algorithms) Add missing argument to handle_supported_key_request

[andybalaam]

This fixes the build

Before this change:

$ cargo check --features=experimental-algorithms
error[E0061]: this method takes 4 arguments but 3 arguments were supplied
   --> crates/matrix-sdk-crypto/src/gossiping/machine.rs:513:30
    |
513 |                         self.handle_supported_key_request(event, &i.room_id, &i.session_id).await
    |                              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ ----- argument #1 of type `&StoreCache` is missing

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.87%. Comparing base (951a435) to head (007803a).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4157      +/-   ##
==========================================
+ Coverage   84.84%   84.87%   +0.02%     
==========================================
  Files         269      269              
  Lines       28799    28799              
==========================================
+ Hits        24434    24442       +8     
+ Misses       4365     4357       -8     

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