Fix hidden lifetime parameter on std::fmt::Formatter

Author: regexident

constraints/src/supported_constraints.rs

@@ -124,7 +124,7 @@ struct SerdeVisitor;
 impl<'de> Visitor<'de> for SerdeVisitor {
     type Value = MediaTrackSupportedConstraints;
 
-    fn expecting(&self, formatter: &mut std::fmt::Formatter) -> std::fmt::Result {
+    fn expecting(&self, formatter: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         formatter.write_str("an object with strings as keys and `true` as values")
     }