Update dependency pg to v1.6.3

Author: renovate[bot]

Gemfile.lock

@@ -425,8 +425,8 @@ GEM
       ast (~> 2.4.1)
       racc
     parslet (2.0.0)
-    pg (1.6.2-arm64-darwin)
-    pg (1.6.2-x86_64-linux)
+    pg (1.6.3-arm64-darwin)
+    pg (1.6.3-x86_64-linux)
     pg_search (2.3.7)
       activerecord (>= 6.1)
       activesupport (>= 6.1)