⬆️ Bump @nuxtjs/pwa from 3.0.0-beta.16 to 3.0.0-beta.19

Bumps [@nuxtjs/pwa](https://github.com/nuxt-community/pwa-module) from 3.0.0-beta.16 to 3.0.0-beta.19.
- [Release notes](https://github.com/nuxt-community/pwa-module/releases)
- [Changelog](https://github.com/nuxt-community/pwa-module/blob/dev/CHANGELOG.md)
- [Commits](https://github.com/nuxt-community/pwa-module/compare/v3.0.0-beta.16...v3.0.0-beta.19)

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

package.json

@@ -15,7 +15,7 @@
     },
     "dependencies": {
         "@nuxtjs/axios": "^5.6.0",
-        "@nuxtjs/pwa": "^3.0.0-0",
+        "@nuxtjs/pwa": "^3.0.0-beta.19",
         "@nuxtjs/toast": "^3.2.1",
         "highlight.js": "^9.15.10",
         "nuxt": "^2.9.2",