chore: remove `-Zmiri-tag-raw-pointers` #77

Job	Run time
changed_paths	4s
rustfmt	8s
Clippy check	12s
Check no_std (alloc)	23s
Compile benchmarks	23s
Miri tests	53s
Check no_std (static)	23s
models in 'mpsc_blocking'	1m 24s
model 'mpsc_send_recv_wrap''	1m 16s
Tests (stable, ubuntu-latest)	18s
models in 'mpsc_async'	3m 32s
Tests (stable, windows-latest)	1m 18s
model 'mpsc_try_send_recv''	1m 23s
models in 'thingbuf'	1m 54s
Tests (stable, macos-latest)	1m 50s
model 'mpsc_try_recv_ref''	1m 35s
models in 'util'	1m 13s
model 'mpsc_test_skip_slot''	2m 39s
model 'mpsc_async::rx_close_unconsumed''	1m 17s
model 'mpsc_blocking::rx_close_unconsumed''	1m 22s
all loom models	1s
	23m 28s

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