fix(deps): update dependency @fastify/swagger to v8

Author: renovate[bot]

package-lock.json

@@ -37,7 +37,7 @@
   },
   "homepage": "https://github.com/godaddy/gasket/tree/main/packages/gasket-plugin-swagger",
   "dependencies": {
-    "@fastify/swagger": "^6.0.0",
+    "@fastify/swagger": "^8.0.0",
     "@types/swagger-ui-express": "^4.1.3",
     "express": "^4.16.3",
     "swagger-jsdoc": "^4.0.0",