fix: `AsyncUdpSocket` backpressure when connection type is not mixed #12181

Job	Run time
Android Build Only (aarch64-linux-android)	1m 14s
cargo deny	26s
Android Build Only (armv7-linux-androideabi)	1m 4s
Checking fmt	28s
Checking docs	1m 2s
check_semver	4m 10s
clippy_check	1m 51s
codespell	6s
Cross Build Only (x86_64-unknown-freebsd)	44s
Cross Test (i686-unknown-linux-gnu)	1m 58s
Minimal Supported Rust Version	1m 2s
Build wasm32	32s
netsim-integration-tests / Netsim	5m 24s
CI Test Suite / Tests (ubuntu-latest, stable, all)	2m 33s
CI Test Suite / Tests (ubuntu-latest, stable, none)	2m 24s
CI Test Suite / Tests (windows-latest, stable, all, x86_64-pc-windows-msvc)	2m 11s
CI Test Suite / Tests (ubuntu-latest, stable, default)	2m 23s
CI Test Suite / Tests (windows-latest, stable, none, x86_64-pc-windows-msvc)	2m 23s
CI Test Suite / Tests (macOS-arm-latest, stable, all)	2m 35s
CI Test Suite / Tests (windows-latest, stable, default, x86_64-pc-windows-msvc)	2m 6s
CI Test Suite / Tests (macOS-arm-latest, stable, none)	2m 23s
CI Test Suite / Tests (macOS-arm-latest, stable, default)	2m 40s
	41m 39s

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