dev: add worker creation after pool thread count drops below what is … #104

Job	Run time
test-canary (2.0.0-rc.4, ubuntu-latest)	5m 41s
test (1.39.1, ubuntu-latest)	5m 35s
test-canary (2.0.0-rc.4, macos-latest)	3m 27s
test (1.39.1, macos-latest)	3m 43s
test-canary (2.0.0-rc.4, windows-latest)	32s
test (1.39.1, windows-latest)	29s
test (1.38.1, ubuntu-latest)	4m 54s
test (1.38.1, macos-latest)	4m 2s
test (1.38.1, windows-latest)	36s
test (1.41.3, ubuntu-latest)	5m 35s
test (1.41.3, macos-latest)	4m 10s
test (1.41.3, windows-latest)	29s
test (1.45.5, ubuntu-latest)	4m 44s
test (1.45.5, macos-latest)	3m 19s
test (1.45.5, windows-latest)	27s
test (1.46.3, ubuntu-latest)	5m 37s
test (1.46.3, macos-latest)	3m 29s
test (1.46.3, windows-latest)	30s
	57m 19s

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