bump version to 0.4.2 #551

Job	Run time
build pgo-optimized on ${{ matrix.os }} / ${{ matrix.interpreter }}	0s
build sdist	15s
bench	1m 49s
build on ${{ matrix.os }} (${{ matrix.target }} - ${{ matrix.interpreter \|\| 'all' }}${{ (((matrix.os == 'linux') && format(' - {0}', (((matrix.manylinux == 'auto') && 'manylinux') \|\| matrix.manylinux))) \|\| '') }})	0s
fuzz on ubuntu-latest	6m 2s
fuzz skip	5m 52s
lint	38s
fuzz on macos-latest	6m 40s
resolve	4s
test on macos-latest	58s
test jiter-python	36s
test on macos-latest	47s
test build on ${{ matrix.os }}	0s
test build on ${{ matrix.target }}-${{ matrix.distro }}	0s
test rust-stable on linux	55s
test rust-nightly on linux	2m 20s
test rust-1.73.0 on linux	1m 0s
inspect-pypi-assets	0s
check	2s
release-python	0s
release	0s
	27m 58s

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