Update dependency config to v5.6.0

Author: renovate[bot]

Gemfile.lock

@@ -74,7 +74,7 @@ GEM
     bigdecimal (3.1.9)
     builder (3.3.0)
     concurrent-ruby (1.3.4)
-    config (5.5.2)
+    config (5.6.1)
       deep_merge (~> 1.2, >= 1.2.1)
       ostruct
     connection_pool (2.5.3)
@@ -191,7 +191,7 @@ GEM
       faraday (>= 1, < 3)
       sawyer (~> 0.9)
     optimist (3.2.1)
-    ostruct (0.6.1)
+    ostruct (0.6.2)
     parallel (1.27.0)
     parser (3.3.8.0)
       ast (~> 2.4.1)