chore(deps): bump @jsii/spec from 0.20.11 to 0.21.0

Bumps [@jsii/spec](https://github.com/aws/jsii/tree/HEAD/packages/@jsii/spec) from 0.20.11 to 0.21.0.
- [Release notes](https://github.com/aws/jsii/releases)
- [Changelog](https://github.com/aws/jsii/blob/master/packages/@jsii/spec/CHANGELOG.md)
- [Commits](https://github.com/aws/jsii/commits/v0.21.0/packages/@jsii/spec)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

tools/awslint/package.json

@@ -16,7 +16,7 @@
     "awslint": "bin/awslint"
   },
   "dependencies": {
-    "@jsii/spec": "^0.20.11",
+    "@jsii/spec": "^0.21.0",
     "camelcase": "^5.3.1",
     "colors": "^1.4.0",
     "fs-extra": "^8.1.0",

yarn.lock

@@ -432,6 +432,13 @@
   dependencies:
     jsonschema "^1.2.5"
 
+"@jsii/spec@^0.21.0":
+  version "0.21.0"
+  resolved "https://registry.yarnpkg.com/@jsii/spec/-/spec-0.21.0.tgz#beb1403e3afbe055e7b7b31ab282febbbf1b023e"
+  integrity sha512-6VV3aOeo3YlElqPtpZncPt4jiZgurF1fyi1qjReSvpVYRuO3zC3aDP+fPzFrjROxcAXewte0+1HGxCaC5cB2pw==
+  dependencies:
+    jsonschema "^1.2.5"
+
 "@lerna/add@3.20.0":
   version "3.20.0"
   resolved "https://registry.yarnpkg.com/@lerna/add/-/add-3.20.0.tgz#bea7edf36fc93fb72ec34cb9ba854c48d4abf309"