submodules: update clippy from 66df92a to c8e3cfb

Changes:
````
travis: temporarily disable rustfmt ci check until #4742 is resolved
rustup #65792
Fix ICE #4579
Add regression test for ICE #4579
Run update_lints for Unicode lint
Re-add false positive check
Add raw string regression test for useless_format lint
Re-factor useless_format lint
Update Unicode lint tests
[Backported] Rustup to #59545
````

Fixes ##65888

Author: matthiaskrgr