Bump oj from 3.5.1 to 3.6.11 (#8815)

Bumps [oj](https://github.com/ohler55/oj) from 3.5.1 to 3.6.11.
- [Release notes](https://github.com/ohler55/oj/releases)
- [Changelog](https://github.com/ohler55/oj/blob/master/CHANGELOG.md)
- [Commits](https://github.com/ohler55/oj/compare/v3.5.1...v3.6.11)

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

Gemfile.lock

@@ -359,7 +359,7 @@ GEM
       concurrent-ruby (~> 1.0.0)
       sidekiq (>= 3.5.0)
       statsd-ruby (~> 1.2.0)
-    oj (3.5.1)
+    oj (3.6.11)
     omniauth (1.8.1)
       hashie (>= 3.4.6, < 3.6.0)
       rack (>= 1.6.2, < 3)
@@ -707,7 +707,7 @@ DEPENDENCIES
   net-ldap (~> 0.10)
   nokogiri (~> 1.8)
   nsa (~> 0.2)
-  oj (~> 3.5)
+  oj (~> 3.6)
   omniauth (~> 1.2)
   omniauth-cas (~> 1.1)
   omniauth-saml (~> 1.10)