Bump net-http-persistent from 4.0.5 to 4.0.6

Bumps [net-http-persistent](https://github.com/drbrain/net-http-persistent) from 4.0.5 to 4.0.6.
- [Release notes](https://github.com/drbrain/net-http-persistent/releases)
- [Changelog](https://github.com/drbrain/net-http-persistent/blob/master/History.txt)
- [Commits](drbrain/net-http-persistent@v4.0.5...v4.0.6)

---
updated-dependencies:
- dependency-name: net-http-persistent
  dependency-version: 4.0.6
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

Gemfile.lock

@@ -207,8 +207,8 @@ GEM
       turbo-rails
     msgpack (1.8.0)
     mutex_m (0.3.0)
-    net-http-persistent (4.0.5)
-      connection_pool (~> 2.2)
+    net-http-persistent (4.0.6)
+      connection_pool (~> 2.2, >= 2.2.4)
     net-imap (0.5.7)
       date
       net-protocol