Bump ioredis from 4.17.3 to 4.19.0

Bumps [ioredis](https://github.com/luin/ioredis) from 4.17.3 to 4.19.0.
- [Release notes](https://github.com/luin/ioredis/releases)
- [Changelog](https://github.com/luin/ioredis/blob/master/Changelog.md)
- [Commits](redis/ioredis@v4.17.3...v4.19.0)

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

package.json

@@ -31,7 +31,7 @@
     "browserify": "^17.0.0",
     "debug": "^4.2.0",
     "dog-names": "^2.0.0",
-    "ioredis": "^4.17.3",
+    "ioredis": "^4.19.0",
     "koa": "^2.13.0",
     "koa-router": "^9.4.0",
     "koa-static": "^5.0.0",