fix(iroh-base)!: Remove unused `getrandom` dependency (#3202) #12615

Job	Run time
Android Build Only (aarch64-linux-android)	1m 7s
Cross Build Only (x86_64-unknown-freebsd)	55s
Android Build Only (armv7-linux-androideabi)	2m 8s
Checking docs	58s
check_semver	2m 20s
Checking fmt	20s
clippy_check	1m 40s
Cross Test (i686-unknown-linux-gnu)	1m 35s
Minimal Supported Rust Version	1m 0s
Build & test wasm32 for browsers	2m 52s
cargo deny	33s
codespell	4s
CI Test Suite / Tests (ubuntu-latest, stable, all)	3m 12s
CI Test Suite / Tests (ubuntu-latest, stable, none)	2m 52s
CI Test Suite / Tests (ubuntu-latest, stable, default)	2m 55s
CI Test Suite / Tests (windows-latest, stable, all, x86_64-pc-windows-msvc)	2m 9s
CI Test Suite / Tests (windows-latest, stable, none, x86_64-pc-windows-msvc)	2m 1s
CI Test Suite / Tests (windows-latest, stable, default, x86_64-pc-windows-msvc)	2m 1s
CI Test Suite / Tests (macOS-arm-latest, stable, all)	2m 28s
CI Test Suite / Tests (macOS-arm-latest, stable, none)	2m 22s
CI Test Suite / Tests (macOS-arm-latest, stable, default)	3m 0s
netsim-integration-tests / Netsim	8m 3s
	46m 35s

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