change literal_string_with_formatting_args lint category to nursery (rust-lang#14014)

This PR changes literal_string_with_formatting_args category from
`suspicious` to `nursery` since there are thousands of false positive on
GitHub.

Closes rust-lang#13989 since it's no longer problematic with such false positive
with ~~`pedantic`~~ `nursery` category.

changelog: [`literal_string_with_formatting_args` ] change category to
`nursery` from `suspicious`

Author: Alexendoo

clippy_lints/src/literal_string_with_formatting_args.rs

@@ -31,7 +31,7 @@ declare_clippy_lint! {
     /// ```
     #[clippy::version = "1.85.0"]
     pub LITERAL_STRING_WITH_FORMATTING_ARGS,
-    suspicious,
+    nursery,
     "Checks if string literals have formatting arguments"
 }