test: improve test performance #173

Job	Run time
Lint	20s
Test dev setup on ubuntu-latest	34s
Test installation of all dependencies	1m 45s
Test dev setup on windows-latest	3m 28s
Test dev setup on macos-latest	30s
Test (Python: 3.8, DB: mysql)	24m 10s
Test (Python: 3.8, DB: postgres)	23m 7s
Test (Python: 3.12, DB: mysql)	27m 14s
Test (Python: 3.12, DB: postgres)	31m 38s
Indicate completion to coveralls	3s
Build python wheel	1m 25s
required-checks-pass	2s
	1h 54m 16s

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