use AsyncWaitGroup instead of JoinHandles

[al8n]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 98.64865% with 1 line in your changes missing coverage. Please review.

Project coverage is 76.00%. Comparing base (a11ad62) to head (ac132fb).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
transports/quic/src/processor.rs	85.71%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #43      +/-   ##
==========================================
+ Coverage   75.83%   76.00%   +0.16%     
==========================================
  Files          64       64              
  Lines        6724     6750      +26     
==========================================
+ Hits         5099     5130      +31     
+ Misses       1625     1620       -5     

Files with missing lines	Coverage Δ
core/src/base.rs	80.85% <100.00%> (+0.20%)	⬆️
core/src/lib.rs	66.66% <ø> (-2.57%)	⬇️
core/src/network/packet/handler.rs	75.60% <100.00%> (-3.88%)	⬇️
core/src/network/packet/listener.rs	80.00% <100.00%> (-1.36%)	⬇️
core/src/network/stream.rs	77.56% <100.00%> (+0.29%)	⬆️
core/src/state.rs	82.40% <100.00%> (+2.61%)	⬆️
transports/net/src/lib.rs	76.71% <100.00%> (+1.45%)	⬆️
transports/quic/src/lib.rs	75.00% <100.00%> (+0.93%)	⬆️
transports/quic/src/processor.rs	65.82% <85.71%> (+0.88%)	⬆️

... and 5 files with indirect coverage changes

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