[Security] Bump net-ldap from 0.3.1 to 0.16.2

Bumps [net-ldap](https://github.com/ruby-ldap/ruby-net-ldap) from 0.3.1 to 0.16.2. **This update includes a security fix.**
- [Release notes](https://github.com/ruby-ldap/ruby-net-ldap/releases)
- [Changelog](https://github.com/ruby-ldap/ruby-net-ldap/blob/master/History.rdoc)
- [Commits](https://github.com/ruby-ldap/ruby-net-ldap/commits/v0.16.2)

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

Gemfile.lock

@@ -107,7 +107,7 @@ GEM
       treetop (~> 1.4.8)
     mime-types (1.25)
     multi_json (1.8.2)
-    net-ldap (0.3.1)
+    net-ldap (0.16.2)
     orm_adapter (0.4.0)
     pg (0.18.4)
     polyglot (0.3.3)