Update dependency @types/utf8 to v3 (#1980)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
|
[@types/utf8](https://redirect.github.com/DefinitelyTyped/DefinitelyTyped/tree/master/types/utf8)
([source](https://redirect.github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/utf8))
| devDependencies | major | [`2.1.6` ->
`3.0.3`](https://renovatebot.com/diffs/npm/@types%2futf8/2.1.6/3.0.3) |

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classic-azure-ts-stream-analytics/package.json

@@ -3,7 +3,7 @@
     "version": "0.1.0",
     "devDependencies": {
         "@types/node": "8.10.66",
-        "@types/utf8": "2.1.6"
+        "@types/utf8": "3.0.3"
     },
     "dependencies": {
         "@pulumi/azure": "6.19.0",