Bump downlevel-dts to 0.10.1 (smithy-lang#587)

Author: trivikr

smithy-typescript-codegen/src/main/resources/software/amazon/smithy/typescript/codegen/base-package.json

@@ -22,7 +22,7 @@
   "devDependencies": {
     "@tsconfig/recommended": "1.0.1",
     "concurrently": "7.0.0",
-    "downlevel-dts": "0.7.0",
+    "downlevel-dts": "0.10.1",
     "rimraf": "^3.0.0",
     "typedoc": "^0.20.0",
     "ts-jest": "^26.4.1",