connection: clean up failed heartbeat sends #1648

Job	Run time
Build wheels / Build source distribution	8s
Build wheels / Prepare matrix to run for 3.13 on `linux,macos-x86,macos-arm,windows,linux-aarch64`	3s
Build wheels / Build wheels for macos-x86 on macos-15-intel	22m 46s
Build wheels / Build wheels for linux-aarch64 on ubuntu-24.04-arm	15m 28s
Build wheels / Build wheels for macos-arm on macos-14	9m 40s
Build wheels / Build wheels for linux on ubuntu-24.04	12m 47s
Build wheels / Build wheels for windows on windows-2022	37m 28s
Publish wheels to PyPi	0s
	1h 38m 20s

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