Remove uncondtional `serde` usage in uv-resolver (#3317) #7

Job	Run time
build binary \| linux	1s
build binary \| windows	1s
build binary \| macos aarch64	4m 27s
build binary \| macos x86_64	1s
cargo clippy \| ubuntu	3m 49s
cargo fmt	25s
cargo clippy \| windows	1s
cargo test \| ubuntu	1s
cargo test \| windows	1s
cargo test \| macos	8m 0s
check windows trampoline	3m 54s
check system \| python on macos x86_64	0s
check system \| python on macos aarch64	14s
check system \| homebrew python on macos aarch64	22s
check cache \| macos aarch64	11s
check system \| pypy on ubuntu	0s
check system \| pyston	0s
check system \| python on debian	0s
check system \| python on fedora	0s
check system \| python on rocky linux ${{ matrix.rocky-version }}	0s
check system \| python on opensuse	0s
check system \| python on ubuntu	0s
ecosystem test \| ${{ matrix.repo }}	0s
check cache \| ubuntu	0s
check system \| alpine	0s
check system \| python via pyenv	0s
check system \| amazonlinux	0s
check system \| python3.10 on windows	0s
check system \| python3.12 via chocolatey	0s
check system \| conda${{ matrix.python-version }} on ${{ matrix.os }}	0s
check system \| python3.13 on windows	0s
check system \| python3.10 on windows x86	0s
check system \| embedded python3.10 on windows	0s
	21m 28s

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