Bump version: 5.14.0 → 5.15.0 #9

Job	Run time
Test against different Python versions (3.7, ubuntu-latest)	27s
Test against different Python versions (3.7, windows-latest)	1m 22s
Test against different Python versions (3.7, macos-latest)	1m 7s
Test against different Python versions (3.8, ubuntu-latest)	1m 1s
Test against different Python versions (3.8, windows-latest)	1m 31s
Test against different Python versions (3.8, macos-latest)	49s
Test against different Python versions (3.9, ubuntu-latest)	34s
Test against different Python versions (3.9, windows-latest)	1m 36s
Test against different Python versions (3.9, macos-latest)	43s
Test against different Python versions (3.11, ubuntu-latest)	31s
Test against different Python versions (3.11, windows-latest)	2m 23s
Test against different Python versions (3.11, macos-latest)	1m 11s
	13m 15s

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