Fix new lint in Rust 1.89 (#985)

Author: SimonSapin

crates/apollo-compiler/src/macros.rs

@@ -3,7 +3,7 @@ macro_rules! serialize_method {
         /// Returns a builder that has chaining methods for setting serialization configuration,
         /// and implements the [`Display`][std::fmt::Display] and [`ToString`] traits
         /// by writing GraphQL syntax.
-        pub fn serialize(&self) -> $crate::ast::serialize::Serialize<Self> {
+        pub fn serialize(&self) -> $crate::ast::serialize::Serialize<'_, Self> {
             $crate::ast::serialize::Serialize {
                 node: self,
                 config: Default::default(),