add missing `attrs` dep, fixing #50 #142

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Job	Run time
test (3.8, ubuntu-latest)	4m 52s
test (3.9, ubuntu-latest)	4m 31s
test (3.10, ubuntu-latest)	4m 26s
test (3.11, ubuntu-latest)	4m 36s
test (3.12, ubuntu-latest)	4m 47s
publish_dev_build	4m 46s
	27m 58s