Fix error message incorrectly referencing 'asserts' instead of 'assert'.

Author: DanielRosenwasser

src/compiler/checker.ts

@@ -48156,7 +48156,7 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {
             }
 
             if (moduleKind === ModuleKind.NodeNext && !isImportAttributes) {
-                return grammarErrorOnFirstToken(node, Diagnostics.Import_assertions_have_been_replaced_by_import_attributes_Use_with_instead_of_asserts);
+                return grammarErrorOnFirstToken(node, Diagnostics.Import_assertions_have_been_replaced_by_import_attributes_Use_with_instead_of_assert);
             }
 
             if (declaration.moduleSpecifier && getEmitSyntaxForModuleSpecifierExpression(declaration.moduleSpecifier) === ModuleKind.CommonJS) {

src/compiler/diagnosticMessages.json

@@ -3983,7 +3983,7 @@
         "category": "Error",
         "code": 2879
     },
-    "Import assertions have been replaced by import attributes. Use 'with' instead of 'asserts'.": {
+    "Import assertions have been replaced by import attributes. Use 'with' instead of 'assert'.": {
         "category": "Error",
         "code": 2880
     },