backport: fix: don't limit max number of concurrent requests

[douglaz]

Related to #3406

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (d286ede) 59.34% compared to head (3c63aa9) 58.94%.
Report is 14 commits behind head on releases/v0.1.

Additional details and impacted files

@@                Coverage Diff                @@
##           releases/v0.1    #3470      +/-   ##
=================================================
- Coverage          59.34%   58.94%   -0.41%     
=================================================
  Files                210      214       +4     
  Lines              45227    45943     +716     
=================================================
+ Hits               26842    27079     +237     
- Misses             18385    18864     +479     

Files	Coverage Δ
fedimint-core/src/api.rs	85.54% <100.00%> (+2.81%)	⬆️
fedimint-client/src/transaction/sm.rs	76.92% <0.00%> (-0.29%)	⬇️

... and 16 files with indirect coverage changes

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[elsirion]

Can you PR to master first and then backport please (or if done already I haven't caught up yet, but the original PR should be linked here)? It's too easy to lose track otherwise.

[douglaz]

Can you PR to master first and then backport please (or if done already I haven't caught up yet, but the original PR should be linked here)? It's too easy to lose track otherwise.

This was on purpose, I didn't want to include this on master/0.1 without testing it first

[justinmoon]

Call: let's target master with this PR, first

[elsirion]

Since #3497 is on master now, let's also merge this one.