Bump rails_failover to 0.5.2.

Bump rails_failover to 0.5.2.

diff --git a/Gemfile.lock b/Gemfile.lock
index 74009a4..1148682 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -280,7 +280,7 @@ GEM
       nokogiri (>= 1.6)
     rails-html-sanitizer (1.3.0)
       loofah (~> 2.3)
-    rails_failover (0.5.1)
+    rails_failover (0.5.2)
       activerecord (~> 6.0)
       railties (~> 6.0)
     rails_multisite (2.3.0)

GitHub sha: 97d12a3a