Update solargraph gem version

Gemfile

@@ -345,7 +345,7 @@ end
 
 group :development do
   gem 'lefthook', '~> 0.7.0', require: false
-  gem 'solargraph', '~> 0.40.4', require: false
+  gem 'solargraph', '~> 0.42', require: false
 
   gem 'letter_opener_web', '~> 1.4.0'
 

Gemfile.lock

@@ -137,7 +137,7 @@ GEM
       net-http-persistent (~> 4.0)
       nokogiri (~> 1.11.0.rc2)
     babosa (1.0.4)
-    backport (1.1.2)
+    backport (1.2.0)
     base32 (0.3.2)
     batch-loader (2.0.1)
     bcrypt (3.1.16)
@@ -1203,10 +1203,11 @@ GEM
     slack-messenger (2.3.4)
     snowplow-tracker (0.6.1)
       contracts (~> 0.7, <= 0.11)
-    solargraph (0.40.4)
-      backport (~> 1.1)
+    solargraph (0.42.3)
+      backport (~> 1.2)
       benchmark
       bundler (>= 1.17.2)
+      diff-lcs (~> 1.4)
       e2mmap
       jaro_winkler (~> 1.5)
       kramdown (~> 2.3)
@@ -1629,7 +1630,7 @@ DEPENDENCIES
   simplecov-cobertura (~> 1.3.1)
   slack-messenger (~> 2.3.4)
   snowplow-tracker (~> 0.6.1)
-  solargraph (~> 0.40.4)
+  solargraph (~> 0.42)
   spamcheck (~> 0.1.0)
   spring (~> 2.1.0)
   spring-commands-rspec (~> 1.0.4)