fix: ignore heavy tests on miri

at least the buffer::tests::zero did not complete in a long time, waited
less for the quickcheck tests, but surely they both completed few rounds
successfully.
2 jobs for fix_unaligned_reads in 9 seconds (queued for 1 second)
latest
Status Job ID Name Coverage
  Test
failed #30658
test:cargo

00:00:09

failed #30657
test:cargo

00:00:09

 
Name Stage Failure
failed
test:cargo Test There has been a runner system failure, please try again
ERROR: Preparation failed: Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running? (docker.go:985:0s)
Will be retried in 3s ...
ERROR: Failed to remove network for build
ERROR: Preparation failed: Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running? (docker.go:985:0s)
Will be retried in 3s ...
ERROR: Failed to remove network for build
ERROR: Preparation failed: Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running? (docker.go:985:0s)
Will be retried in 3s ...
ERROR: Job failed (system failure): Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running? (docker.go:985:0s)