remove hardcoded version of psych

Gemfile

@@ -55,7 +55,6 @@ gem "omniauth-rails_csrf_protection", "~> 1.0"
 gem "omniauth-saml", "~> 2.0"
 gem "pexels", "~> 0.5.0"
 gem "pg", "~> 1.1"
-gem "psych", "= 5.1.0"
 gem "puma"
 gem "rails", "~> 7.1.0"
 gem "rails-autocomplete", "~> 2.0"

Gemfile.lock

@@ -668,7 +668,6 @@ DEPENDENCIES
   omniauth-saml (~> 2.0)
   pexels (~> 0.5.0)
   pg (~> 1.1)
-  psych (= 5.1.0)
   puma
   rack-mini-profiler (~> 2.0)
   rails (~> 7.1.0)