Gemfile: drop yajl and faraday gems

We used to use these to talk to elasticsearch, but they were dropped by
2577930 (Replace Tire gem by newer elasticsearch gem, 2018-12-02).

Author: peff

Gemfile

@@ -7,15 +7,12 @@ gem "rails", "~> 6.0"
 
 gem "asciidoctor", "~> 2.0.0"
 gem "elasticsearch", "2.0.2"
-gem "faraday"
-gem "faraday_middleware"
 gem "iso8601"
 gem "octokit"
 gem "puma"
 
 gem "diffy"
 gem "nokogiri"
-gem "yajl-ruby"
 
 # Assets
 gem "listen"

Gemfile.lock

@@ -112,8 +112,6 @@ GEM
       multipart-post (>= 1.2, < 3)
       ruby2_keywords
     faraday-net_http (1.0.1)
-    faraday_middleware (1.0.0)
-      faraday (~> 1.0)
     ffi (1.15.0)
     foreman (0.87.2)
     globalid (0.4.2)
@@ -304,7 +302,6 @@ GEM
     websocket-driver (0.7.3)
       websocket-extensions (>= 0.1.0)
     websocket-extensions (0.1.5)
-    yajl-ruby (1.4.1)
     zeitwerk (2.4.2)
 
 PLATFORMS
@@ -321,8 +318,6 @@ DEPENDENCIES
   elasticsearch (= 2.0.2)
   fabrication
   factory_bot_rails
-  faraday
-  faraday_middleware
   foreman
   iso8601
   listen
@@ -345,7 +340,6 @@ DEPENDENCIES
   uglifier
   vcr
   webmock
-  yajl-ruby
 
 RUBY VERSION
    ruby 2.7.3p183