Remove redundant gem requirements for unsupported ruby versions

Gemfile

@@ -3,12 +3,6 @@ source "https://rubygems.org"
 # Require rails
 gem "rails", "6.0.3.4"
 
-# Require things which have moved to gems in ruby 1.9
-gem "bigdecimal", "~> 1.1.0", :platforms => :ruby_19
-
-# Require things which have moved to gems in ruby 2.0
-gem "psych", :platforms => :ruby_20
-
 # Require json for multi_json
 gem "json"
 

Gemfile.lock

@@ -100,7 +100,6 @@ GEM
       html_tokenizer (~> 0.0.6)
       parser (>= 2.4)
       smart_properties
-    bigdecimal (1.1.0)
     binding_of_caller (1.0.0)
       debug_inspector (>= 0.0.1)
     bootsnap (1.5.1)
@@ -325,7 +324,6 @@ GEM
     pg (1.2.3)
     popper_js (1.16.0)
     progress (3.5.2)
-    psych (3.3.0)
     public_suffix (4.0.6)
     puma (5.1.1)
       nio4r (~> 2.0)
@@ -476,7 +474,6 @@ DEPENDENCIES
   autoprefixer-rails
   aws-sdk-s3
   better_errors
-  bigdecimal (~> 1.1.0)
   binding_of_caller
   bootsnap (>= 1.4.2)
   bootstrap (~> 4.5.0)
@@ -524,7 +521,6 @@ DEPENDENCIES
   omniauth-windowslive
   openstreetmap-deadlock_retry (>= 1.3.0)
   pg
-  psych
   puma (~> 5.0)
   quad_tile (~> 1.0.1)
   r2 (~> 0.2.7)