chore: remove `-Zmiri-tag-raw-pointers` #78

Job	Run time
changed_paths	4s
Compile benchmarks	18s
Tests (stable, ubuntu-latest)	19s
Tests (stable, windows-latest)	1m 53s
Clippy check	10s
Check no_std (alloc)	9s
Tests (stable, macos-latest)	1m 14s
Miri tests	45s
Check no_std (static)	21s
models in 'mpsc_blocking'	1m 29s
rustfmt	4s
model 'mpsc_send_recv_wrap''	1m 20s
model 'mpsc_try_send_recv''	1m 44s
model 'mpsc_try_recv_ref''	1m 27s
models in 'mpsc_async'	3m 46s
model 'mpsc_test_skip_slot''	2m 35s
models in 'thingbuf'	1m 56s
models in 'util'	1m 15s
model 'mpsc_async::rx_close_unconsumed''	1m 7s
model 'mpsc_blocking::rx_close_unconsumed''	1m 10s
all loom models	1s
	23m 7s

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