Merge pull request #1925 from alphagov/dependabot/bundler/pg-1.6.3

Author: govuk-ci

Gemfile.lock

@@ -520,10 +520,10 @@ GEM
     parser (3.3.9.0)
       ast (~> 2.4.1)
       racc
-    pg (1.6.2)
-    pg (1.6.2-aarch64-linux)
-    pg (1.6.2-arm64-darwin)
-    pg (1.6.2-x86_64-linux)
+    pg (1.6.3)
+    pg (1.6.3-aarch64-linux)
+    pg (1.6.3-arm64-darwin)
+    pg (1.6.3-x86_64-linux)
     plek (5.2.2)
     pp (0.6.3)
       prettyprint