Upgrade fog-aws from 2.0 to 3.5 (#2800)

Gemfile

@@ -46,7 +46,7 @@ gem "fastly", "~> 1.15" # Client library for the Fastly acceleration system
 gem "fastly-rails", "~> 0.8" # Fastly dynamic caching integration for Rails
 gem "feedjira", "~> 2.2" # A feed fetching and parsing library
 gem "figaro", "~> 1.1" # Simple, Heroku-friendly Rails app configuration using ENV and a single YAML file
-gem "fog-aws", "2.0.0" # 'fog' gem to support Amazon Web Services
+gem "fog-aws", "~> 3.5" # 'fog' gem to support Amazon Web Services
 gem "front_matter_parser", "~> 0.2" # Parse a front matter from syntactically correct strings or files
 gem "gemoji", "~> 3.0.1" # Character information and metadata for standard and custom emoji
 gem "gibbon", "~> 3.2" # API wrapper for MailChimp's API

Gemfile.lock

@@ -305,7 +305,7 @@ GEM
     et-orbi (1.1.6)
       tzinfo
     eventmachine (1.2.5)
-    excon (0.60.0)
+    excon (0.64.0)
     execjs (2.7.0)
     factory_bot (5.0.2)
       activesupport (>= 4.2.0)
@@ -333,17 +333,18 @@ GEM
       thor (~> 0.14)
     fix-db-schema-conflicts (3.0.3)
       rubocop (>= 0.38.0)
-    fog-aws (2.0.0)
-      fog-core (~> 1.38)
-      fog-json (~> 1.0)
+    fog-aws (3.5.0)
+      fog-core (~> 2.1)
+      fog-json (~> 1.1)
       fog-xml (~> 0.1)
       ipaddress (~> 0.8)
-    fog-core (1.45.0)
+    fog-core (2.1.2)
       builder
       excon (~> 0.58)
       formatador (~> 0.2)
-    fog-json (1.0.2)
-      fog-core (~> 1.0)
+      mime-types
+    fog-json (1.2.0)
+      fog-core
       multi_json (~> 1.10)
     fog-xml (0.1.3)
       fog-core
@@ -867,7 +868,7 @@ DEPENDENCIES
   feedjira (~> 2.2)
   figaro (~> 1.1)
   fix-db-schema-conflicts (~> 3.0)
-  fog-aws (= 2.0.0)
+  fog-aws (~> 3.5)
   foreman!
   front_matter_parser (~> 0.2)
   gemoji (~> 3.0.1)