upgrade to smallvec 2 to fix invariant lifetimes #600

Job	Run time
build sdist	13s
bench	7m 10s
build pgo-optimized on ${{ matrix.os }} / ${{ matrix.interpreter }}	0s
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	2m 37s
fuzz skip	1m 46s
lint	31m 55s
resolve	8s
fuzz on macos-latest	7m 30s
test on macos-latest	52s
test jiter-python	32s
test on macos-latest	1m 0s
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 9s
test rust-1.74.0 on linux	34s
inspect-pypi-assets	0s
check	4s
release	0s
release-python	0s
	57m 25s

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