build(deps): bump @nuxtjs/apollo in /webapp

Bumps [@nuxtjs/apollo](https://github.com/nuxt-community/apollo-module) from 4.0.0-rc15 to 4.0.0-rc16.
- [Release notes](https://github.com/nuxt-community/apollo-module/releases)
- [Commits](nuxt-modules/apollo@v4.0.0-rc.15...v4.0.0-rc.16)

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

webapp/package.json

@@ -53,7 +53,7 @@
   },
   "dependencies": {
     "@human-connection/styleguide": "0.5.21",
-    "@nuxtjs/apollo": "^4.0.0-rc15",
+    "@nuxtjs/apollo": "^4.0.0-rc16",
     "@nuxtjs/axios": "~5.8.0",
     "@nuxtjs/dotenv": "~1.4.1",
     "@nuxtjs/pwa": "^3.0.0-beta.19",