Merge pull request #700 from ohbarye/dependabot/bundler/backend/pg-1.3.4

Bump pg from 1.2.3 to 1.3.4 in /backend

Author: ohbarye

backend/Gemfile.lock

@@ -107,7 +107,7 @@ GEM
     nokogiri (1.13.3)
       mini_portile2 (~> 2.8.0)
       racc (~> 1.4)
-    pg (1.2.3)
+    pg (1.3.4)
     public_suffix (4.0.6)
     puma (5.5.2)
       nio4r (~> 2.0)