⬆️ Upgrade mimemagic version in appraisals

`mimemagic` removed version 0.3.3 (up through 0.3.6) and it was preventing the appraisal tests from running.

This update was first started in #1114.

Author: kylemellander

gemfiles/rails_5.2_no_sprockets.gemfile.lock

@@ -127,7 +127,7 @@ GEM
     marcel (0.3.3)
       mimemagic (~> 0.3.2)
     method_source (0.9.2)
-    mimemagic (0.3.3)
+    mimemagic (0.3.10)
     mini_mime (1.0.2)
     mini_portile2 (2.4.0)
     minitest (5.13.0)

gemfiles/rails_5.2_no_sprockets_webpacker_3.gemfile.lock

@@ -128,7 +128,7 @@ GEM
     marcel (0.3.3)
       mimemagic (~> 0.3.2)
     method_source (0.9.2)
-    mimemagic (0.3.3)
+    mimemagic (0.3.10)
     mini_mime (1.0.2)
     mini_portile2 (2.4.0)
     mini_racer (0.2.8)

gemfiles/rails_5.2_no_sprockets_webpacker_4.gemfile.lock

@@ -128,7 +128,7 @@ GEM
     marcel (0.3.3)
       mimemagic (~> 0.3.2)
     method_source (0.9.2)
-    mimemagic (0.3.3)
+    mimemagic (0.3.10)
     mini_mime (1.0.2)
     mini_portile2 (2.4.0)
     mini_racer (0.2.8)

gemfiles/rails_5.2_sprockets_3.gemfile.lock

@@ -128,7 +128,7 @@ GEM
     marcel (0.3.3)
       mimemagic (~> 0.3.2)
     method_source (0.9.2)
-    mimemagic (0.3.3)
+    mimemagic (0.3.10)
     mini_mime (1.0.2)
     mini_portile2 (2.4.0)
     mini_racer (0.2.8)

gemfiles/rails_5.2_sprockets_4.gemfile.lock

@@ -115,7 +115,7 @@ GEM
     jbuilder (2.9.1)
       activesupport (>= 4.2.0)
     json (2.3.0)
-    libv8 (7.3.492.27.1-x86_64-darwin-18)
+    libv8 (7.3.492.27.1)
     listen (3.0.8)
       rb-fsevent (~> 0.9, >= 0.9.4)
       rb-inotify (~> 0.9, >= 0.9.7)
@@ -128,7 +128,9 @@ GEM
     marcel (0.3.3)
       mimemagic (~> 0.3.2)
     method_source (0.9.2)
-    mimemagic (0.3.3)
+    mimemagic (0.3.10)
+      nokogiri (~> 1)
+      rake
     mini_mime (1.0.2)
     mini_portile2 (2.4.0)
     mini_racer (0.2.8)
@@ -242,4 +244,4 @@ DEPENDENCIES
   webdrivers
 
 BUNDLED WITH
-   2.1.2
+   2.2.26