Added missing dependency.

[s3rius]

This dependency is used in for pydantic compatibility. It appears in tests, but it doesn't exist in raw installation.

[codecov-commenter]

Codecov Report

Merging #172 (0edb69f) into develop (e66f3aa) will increase coverage by 3.93%.
The diff coverage is 69.77%.

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@@             Coverage Diff             @@
##           develop     #172      +/-   ##
===========================================
+ Coverage    67.62%   71.55%   +3.93%     
===========================================
  Files           37       45       +8     
  Lines          942     1424     +482     
===========================================
+ Hits           637     1019     +382     
- Misses         305      405     +100     

Impacted Files	Coverage Δ
taskiq/abc/middleware.py	100.00% <ø> (ø)
taskiq/abc/result_backend.py	100.00% <ø> (ø)
taskiq/cli/watcher.py	0.00% <ø> (ø)
taskiq/cli/worker/log_collector.py	100.00% <ø> (ø)
taskiq/cli/worker/process_manager.py	0.00% <0.00%> (ø)
taskiq/cli/worker/run.py	0.00% <0.00%> (ø)
taskiq/events.py	100.00% <ø> (ø)
taskiq/result/v1.py	0.00% <0.00%> (ø)
taskiq/result_backends/dummy.py	100.00% <ø> (ø)
taskiq/middlewares/prometheus_middleware.py	25.86% <25.86%> (ø)
... and 28 more

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