Update dependency @types/superagent to v8 (#1978)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
|
[@types/superagent](https://redirect.github.com/DefinitelyTyped/DefinitelyTyped/tree/master/types/superagent)
([source](https://redirect.github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/superagent))
| devDependencies | major | [`4.1.24` ->
`8.1.9`](https://renovatebot.com/diffs/npm/@types%2fsuperagent/4.1.24/8.1.9)
|

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aws-ts-slackbot/package.json

@@ -14,7 +14,7 @@
     },
     "devDependencies": {
         "@types/qs": "6.9.18",
-        "@types/superagent": "4.1.24",
+        "@types/superagent": "8.1.9",
         "typescript": "4.9.5"
     }
 }

gcp-ts-slackbot/package.json

@@ -13,6 +13,6 @@
     },
     "devDependencies": {
         "@types/qs": "6.9.18",
-        "@types/superagent": "4.1.24"
+        "@types/superagent": "8.1.9"
     }
 }