Bump net-http-persistent from 4.0.1 to 4.0.2

Bumps [net-http-persistent](https://github.com/drbrain/net-http-persistent) from 4.0.1 to 4.0.2.
- [Release notes](https://github.com/drbrain/net-http-persistent/releases)
- [Changelog](https://github.com/drbrain/net-http-persistent/blob/master/History.txt)
- [Commits](https://github.com/drbrain/net-http-persistent/compare/v4.0.1...v4.0.2)

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

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

Gemfile.lock

@@ -123,7 +123,7 @@ GEM
     chronic (0.10.2)
     coderay (1.1.3)
     concurrent-ruby (1.2.2)
-    connection_pool (2.3.0)
+    connection_pool (2.4.0)
     crack (0.4.5)
       rexml
     crass (1.0.6)
@@ -243,7 +243,7 @@ GEM
     multi_json (1.15.0)
     multi_xml (0.6.0)
     nested_form (0.3.2)
-    net-http-persistent (4.0.1)
+    net-http-persistent (4.0.2)
       connection_pool (~> 2.2)
     net-imap (0.3.4)
       date