bump dev version to 0.6.3 #331

Job	Run time
sdist	4m 39s
cibuildwheel ubuntu-22.04/x86_64/cpython/many	19m 17s
cibuildwheel ubuntu-22.04/x86_64/cpython/musl	21m 19s
cibuildwheel ubuntu-22.04/x86_64/pypy/many	10m 10s
cibuildwheel ubuntu-22.04/arm64/cpython/many	1h 31m 5s
cibuildwheel ubuntu-22.04/arm64/cpython/musl	2h 14m 55s
cibuildwheel ubuntu-22.04/arm64/pypy/many	1h 0m 36s
cibuildwheel macos-12/x86_64/cpython/many	18m 6s
cibuildwheel macos-12/x86_64/pypy/many	10m 32s
cibuildwheel macos-12/arm64/cpython/many	21m 9s
upload_all	0s
	6h 31m 48s

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