fix: clippy warning of rust 1.8.4 (#14984)

# Description

I'm on rust toolchain 1.8.4, and I can see clippy warnings that can't be
caught by the ci workflow, primarily related to lifetime params.

I think it doesn't hurt to fix those in advance.

# User-Facing Changes

# Tests + Formatting

# After Submitting

crates/nu-protocol/src/errors/cli_error.rs

@@ -96,7 +96,7 @@ impl std::fmt::Debug for CliError<'_> {
     }
 }
 
-impl<'src> miette::Diagnostic for CliError<'src> {
+impl miette::Diagnostic for CliError<'_> {
     fn code<'a>(&'a self) -> Option<Box<dyn std::fmt::Display + 'a>> {
         self.0.code()
     }