feat(patchable): respect http proxy environment variables #23

Job	Run time
Run cargo-deny (bans licenses sources)	38s
Run cargo-deny (advisories)	40s
Build patchable (x86_64-unknown-linux-gnu, ubuntu-latest)	51s
Build patchable (aarch64-unknown-linux-gnu, ubuntu-24.04-arm)	45s
Build patchable (aarch64-apple-darwin, macos-latest)	58s
	3m 52s

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