Merge pull request #540 from ruby/dependabot/bundler/pg-1.6.0

Bump pg from 1.5.9 to 1.6.0

Author: hsbt

Gemfile.lock

@@ -190,7 +190,11 @@ GEM
       racc (~> 1.4)
     nokogiri (1.18.8-x86_64-linux-musl)
       racc (~> 1.4)
-    pg (1.5.9)
+    pg (1.6.0)
+    pg (1.6.0-aarch64-linux)
+    pg (1.6.0-arm64-darwin)
+    pg (1.6.0-x86_64-darwin)
+    pg (1.6.0-x86_64-linux)
     power_assert (2.0.5)
     pp (0.6.2)
       prettyprint