Remove Python 2-only methods from URLOpen audit #20275

Job	Run time
benchmarks	16m 7s
cargo clippy	2m 26s
cargo fuzz	6m 19s
cargo fmt	20s
cargo test \| ubuntu-latest	6m 25s
cargo udeps	3m 26s
cargo test (wasm)	1m 38s
cargo test \| windows-latest	10m 42s
Determine changes	12s
mkdocs	2m 51s
pre-commit	1m 55s
python package	2m 11s
test scripts	1m 5s
Formatter ecosystem and progress checks	0s
ecosystem	8m 0s
	1h 3m 37s

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