Bump version to 0.6.1 #10

Job	Run time
lint	41s
build-package	36s
unit-test (3.10, macos-latest)	34s
unit-test (3.10, ubuntu-latest)	28s
unit-test (3.10, windows-latest)	1m 7s
unit-test (3.11, macos-latest)	19s
unit-test (3.11, ubuntu-latest)	26s
unit-test (3.11, windows-latest)	45s
unit-test (3.12, macos-latest)	21s
unit-test (3.12, ubuntu-latest)	29s
unit-test (3.12, windows-latest)	57s
unit-test (3.7, ubuntu-latest)	28s
unit-test (3.7, windows-latest)	1m 8s
unit-test (3.8, macos-latest)	1m 1s
unit-test (3.8, ubuntu-latest)	32s
unit-test (3.8, windows-latest)	1m 9s
unit-test (3.9, macos-latest)	37s
unit-test (3.9, ubuntu-latest)	21s
unit-test (3.9, windows-latest)	1m 4s
unit-test (pypy-3.10, macos-latest)	43s
unit-test (pypy-3.10, windows-latest)	2m 6s
unit-test (pypy-3.10, ubuntu-latest)	1m 21s
publish-package	29s
sign-package	21s
	18m 3s

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