build(deps): bump redis from 4.5.1 to 4.6.6

Bumps [redis](https://github.com/redis/node-redis) from 4.5.1 to 4.6.6.
- [Release notes](https://github.com/redis/node-redis/releases)
- [Changelog](https://github.com/redis/node-redis/blob/master/CHANGELOG.md)
- [Commits](https://github.com/redis/node-redis/compare/redis@4.5.1...redis@4.6.6)

---
updated-dependencies:
- dependency-name: redis
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

package.json

@@ -69,7 +69,7 @@
     "haraka-plugin-uribl": "^1.0.6",
     "haraka-plugin-watch": "^2.0.2",
     "ocsp": "~1.2.0",
-    "redis": "~4.5.1",
+    "redis": "~4.6.6",
     "tmp": "~0.2.1"
   },
   "devDependencies": {