Remove unused `seek` methods (#3526) #6165

Job	Run time
cargo fmt	36s
Determine changes	6s
cargo clippy \| ubuntu	57s
cargo clippy \| windows	3m 56s
cargo test \| ubuntu	4m 13s
cargo test \| windows	7m 16s
cargo test \| macos	4m 51s
build binary \| linux	2m 3s
build binary \| macos aarch64	1m 12s
build binary \| macos x86_64	1m 53s
build binary \| windows	4m 30s
check windows trampoline	3m 18s
benchmarks	1m 56s
check system \| python on fedora	41s
check system \| python on debian	52s
check cache \| ubuntu	50s
ecosystem test \| prefecthq/prefect	2m 5s
check system \| python on opensuse	34s
ecosystem test \| pallets/flask	15s
check system \| python on rocky linux 8	35s
check system \| python on ubuntu	15s
check system \| python on rocky linux 9	26s
check system \| alpine	23s
check system \| amazonlinux	25s
check system \| python via pyenv	1m 42s
check system \| pypy on ubuntu	32s
check system \| pyston	3m 48s
check system \| python on macos x86_64	24s
check cache \| macos aarch64	10s
check system \| homebrew python on macos aarch64	18s
check system \| python on macos aarch64	15s
check system \| python3.12 via chocolatey	59s
check system \| python3.10 on windows	51s
check system \| embedded python3.10 on windows	28s
check system \| conda3.8 on linux	42s
check system \| python3.13 on windows	1m 26s
check system \| conda3.11 on linux	40s
check system \| python3.10 on windows x86	59s
check system \| conda3.8 on windows	2m 3s
check system \| conda3.11 on windows	2m 1s
check system \| conda3.8 on macos	43s
check system \| conda3.11 on macos	43s
	1h 2m 52s

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