Remove dependency on async-trait.

[davidv1992]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.

Project coverage is 83.30%. Comparing base (30d6185) to head (6c5fa9c).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
ntpd/src/daemon/spawn/mod.rs	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1922      +/-   ##
==========================================
- Coverage   83.44%   83.30%   -0.15%     
==========================================
  Files          71       71              
  Lines       19237    19276      +39     
==========================================
+ Hits        16053    16058       +5     
- Misses       3184     3218      +34     

Flag	Coverage Δ
fuzz-cookie_parsing_sound	0.45% <ø> (ø)
fuzz-duration_from_float	0.29% <ø> (ø)
fuzz-encrypted_client_parsing	7.18% <ø> (-0.98%)	⬇️
fuzz-encrypted_server_parsing	10.82% <ø> (-0.07%)	⬇️
fuzz-ipfilter	2.75% <ø> (ø)
fuzz-key_exchange_request_parsing	2.30% <ø> (-1.23%)	⬇️
fuzz-key_exchange_response_parsing	2.63% <ø> (-1.54%)	⬇️
fuzz-packet_keyset	5.40% <ø> (-0.83%)	⬇️
fuzz-packet_parsing_sound	6.23% <ø> (-2.54%)	⬇️
fuzz-record_encode_decode	3.19% <ø> (-0.04%)	⬇️
test-aarch64-apple-darwin	83.02% <0.00%> (-0.08%)	⬇️
test-x86_64-unknown-linux-gnu	82.93% <0.00%> (-0.08%)	⬇️
test-x86_64-unknown-linux-musl	82.93% <0.00%> (-0.08%)	⬇️

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