submodules: update clippy from 1df5766 to a3c77f6

Changes:
````
s/rustfmt-preview/rustfmt/
Swap if branches
Fix c_void false positive caused by libc refactoring
rustup rust-lang#56502 ( .hir -> .hir() )
typo: emum → enum
Fix format.
Add sysroot gettinh code to dogfood tests.
Add sysroot getting code to tests.
Don't try to determine sysroot. rustc_driver will use default value.
Fix suggestion for multiple derefs
Fix `clone_on_copy` not detecting derefs sometimes
````

Author: matthiaskrgr