Fix cfg-specific unused lints

sqlx-core/src/common/statement_cache.rs

@@ -65,6 +65,7 @@ impl<T> StatementCache<T> {
     }
 
     /// Returns true if the cache capacity is more than 0.
+    #[allow(dead_code)] // Only used for some `cfg`s
     pub fn is_enabled(&self) -> bool {
         self.capacity() > 0
     }

sqlx-macros/src/query/mod.rs

@@ -187,7 +187,7 @@ impl<DB: Database> DescribeExt for Describe<DB> {}
 fn expand_with_data<DB: DatabaseExt>(
     input: QueryMacroInput,
     data: QueryData<DB>,
-    offline: bool,
+    #[allow(unused_variables)] offline: bool,
 ) -> crate::Result<TokenStream>
 where
     Describe<DB>: DescribeExt,