Update Ruby gems. (#314)

Author: conradwt

Gemfile.lock

@@ -89,7 +89,7 @@ GEM
       bundler (>= 1.2.0, < 3)
       thor (~> 1.0)
     concurrent-ruby (1.3.5)
-    connection_pool (2.5.4)
+    connection_pool (2.5.5)
     crass (1.0.6)
     date (3.5.0)
     debug (1.11.0)
@@ -242,7 +242,7 @@ GEM
       zeitwerk (~> 2.6)
     rainbow (3.1.1)
     rake (13.3.1)
-    rdoc (6.15.1)
+    rdoc (6.16.0)
       erb
       psych (>= 4.0.0)
       tsort
@@ -284,7 +284,7 @@ GEM
       lint_roller (~> 1.1)
       rubocop (>= 1.75.0, < 2.0)
       rubocop-ast (>= 1.47.1, < 2.0)
-    rubocop-rails (2.34.0)
+    rubocop-rails (2.34.1)
       activesupport (>= 4.2.0)
       lint_roller (~> 1.1)
       rack (>= 1.1)