Suppress a new pedantic lint

serde/src/lib.rs

@@ -90,6 +90,7 @@
     feature = "cargo-clippy",
     allow(
         // not available in our oldest supported compiler
+        checked_conversions,
         const_static_lifetime,
         empty_enum,
         redundant_field_names,

serde_derive/src/lib.rs

@@ -35,6 +35,7 @@
     feature = "cargo-clippy",
     allow(
         cast_possible_truncation,
+        checked_conversions,
         doc_markdown,
         enum_glob_use,
         filter_map,