submodules: update clippy from 164310d to dc69a5c

Changes:
````
ci: temporarily disable rustfmt checks/tetss since it's broken for nightly
rustup rust-lang#62964
Bump version of clippy_dummy
update test stderr, not sure which rustc pull request caused this.
rustup rust-lang#62859
Fix tests for edition 2018 compatibility
Revert "Revert global fmt config and use `rustfmt::skip`"
Fix breakage due to rust-lang#60913
Fix breakage due to rust-lang#62705
Revert global fmt config and use `rustfmt::skip`
Fix fmt
rustup rust-lang#62679
Update pulldown-cmark to 0.5.3
rustup rust-lang#62764
Add test
Format code
Decrease maximum length for stderr files
Improved imports
Fix "unkown clippy lint" error in UI test.
Corrections for PR review.
Implement lint for inherent to_string() method.
UI Test Cleanup: Extract match_ref_pats tests
Update UI tests
Allow no_effect lint
Remove comment
cargo fmt
UI Test Cleanup: Split up checked_unwrap tests
Removed lintining on never type.
UI Test Cleanup: Split out out_of_bounds_indexing
false positives fixes of `implicit_return`
Ignore generated fresh lifetimes in elision check.
````

Author: matthiaskrgr