rust-grep testing migration.

[peter green <plugwash@p10link.net>]

Hi

Rust-grep is currently blocked from testing migration because of an autopkgtest failure on arm64, it appears that the test failed due to a version mismatch issue. The test was run over three weeks ago and the offending version is no longer in testing.

I tried hitting the "retry" button a few days ago and the test appeared in the pending queue for a while. However it has now disappeared from the pending queue and yet there are no new test results at https://ci.debian.net/data/autopkgtest/testing/arm64/r/rust-grep/

Can someone take a look and try to unjam things?