Mark unnecessary_first_then_check and byte_char_slices as Applicable

clippy_lints/src/byte_char_slices.rs

@@ -41,7 +41,7 @@ fn check_expr(&mut self, cx: &EarlyContext<'_>, expr: &Expr) {
                 "can be more succinctly written as a byte str",
                 "try",
                 format!("b\"{slice}\""),
-                Applicability::MaybeIncorrect,
+                Applicability::MachineApplicable,
             );
         }
     }

clippy_lints/src/methods/unnecessary_first_then_check.rs

@@ -50,7 +50,7 @@ pub(super) fn check(
             ),
             "replace this with",
             suggestion,
-            Applicability::MaybeIncorrect,
+            Applicability::MachineApplicable,
         );
     }
 }