Include deprecationReason when capturing fields in toConfig()

Author: trevor-scheer

src/type/definition.ts

@@ -1631,7 +1631,7 @@ export class GraphQLInputObjectType {
     this.extensions = config.extensions && toObjMap(config.extensions);
     this.astNode = config.astNode;
     this.extensionASTNodes = config.extensionASTNodes ?? [];
-
+    
     this._fields = defineInputFieldMap.bind(undefined, config);
     devAssert(typeof config.name === 'string', 'Must provide name.');
   }
@@ -1650,6 +1650,7 @@ export class GraphQLInputObjectType {
       defaultValue: field.defaultValue,
       extensions: field.extensions,
       astNode: field.astNode,
+      deprecationReason: field.deprecationReason,
     }));
 
     return {