fix: fix senders hanging when the buffer is full (#85) #88

Job	Run time
changed_paths	4s
rustfmt	8s
Tests (stable, ubuntu-latest)	28s
Tests (stable, windows-latest)	1m 19s
Check no_std (alloc)	12s
Tests (stable, macos-latest)	44s
Compile benchmarks	14s
Clippy check	11s
Check no_std (static)	11s
models in 'mpsc_blocking'	1m 33s
model 'mpsc_send_recv_wrap''	1m 44s
model 'mpsc_try_send_recv''	1m 42s
model 'mpsc_try_recv_ref''	1m 44s
models in 'mpsc_async'	2m 35s
model 'mpsc_test_skip_slot''	1m 41s
models in 'thingbuf'	2m 6s
model 'mpsc_async::rx_close_unconsumed''	1m 22s
models in 'util'	1m 17s
model 'mpsc_blocking::rx_close_unconsumed''	1m 18s
Miri tests	1m 20s
all loom models	1s
	21m 54s

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