Enable clippy support for format-like macros

[nyurik]

Add #[clippy::format_args] as described in Clippy book

This is a new feature in v1.85

[Thomasdezeeuw]

How does this work with older Clippy versions? Is this just ignored?

[nyurik]

• Older Clippy would work fine on anything that uses log as a dependency.
• Older Clippy would only fail if you try to run it on the log crate itself - because it won't recognize the lint even though it thinks it "should". This is usually OK because unlike using it as a dependency, the lib itself should only be checked by one (stable) version of Clippy as part of CI

[KodrAus]

Thanks @nyurik. This looks like it should be compatible with the log! macro syntax.