graphql: Return isDeprecated: false for __InputValue in introspection

Author: dimitrovmaksim

graphql/src/introspection/resolver.rs

@@ -300,6 +300,8 @@ fn input_value(
                 .map_or(r::Value::Null, |value| {
                     r::Value::String(format!("{}", value))
                 }),
+        isDeprecated: false,
+        deprecationReason: r::Value::Null,
     }
 }
 

store/test-store/tests/graphql/introspection.rs

@@ -883,6 +883,8 @@ async fn successfully_runs_introspection_query_against_complex_schema() {
           description
           type { ...TypeRef }
           defaultValue
+          isDeprecated
+          deprecationReason
         }
 
         fragment TypeRef on __Type {