Move use_self to nursery

Closes #4859

We have a lot of false positives in this lint, so I think it makes sense
to move this to the nursery until they are resolved.

changelog: Move `use_self` lint to nursery, due to many false positives

clippy_lints/src/use_self.rs

@@ -43,7 +43,7 @@ declare_clippy_lint! {
     /// }
     /// ```
     pub USE_SELF,
-    pedantic,
+    nursery,
     "Unnecessary structure name repetition whereas `Self` is applicable"
 }
 

src/lintlist/mod.rs

@@ -2193,7 +2193,7 @@ pub const ALL_LINTS: [Lint; 338] = [
     },
     Lint {
         name: "use_self",
-        group: "pedantic",
+        group: "nursery",
         desc: "Unnecessary structure name repetition whereas `Self` is applicable",
         deprecation: None,
         module: "use_self",