submodules: update clippy from 1838bfe to 280069d

Changes:
````
Rustfmt all the things
Don't make decisions on values that don't represent the decision
Rustup
Actually check for constants.
formatting fix
Update clippy_lints/src/needless_bool.rs
formatting fix
needless bool lint suggestion is wrapped in brackets if it is an "else" clause of an "if-else" statement
Remove negative integer literal checks.
Fix `implicit_return` false positives.
````

Author: matthiaskrgr