remove infinity hack in favor of open range (available in Ruby 2.6)

Author: igor-makarov

lib/cocoapods-core/source/manager.rb

@@ -471,8 +471,7 @@ def name_for_url(url)
         end
 
         name = base
-        infinity = 1.0 / 0
-        (1..infinity).each do |i|
+        (1..).each do |i|
           break unless source_dir(name).exist?
           name = "#{base}-#{i}"
         end

spec/source/manager_spec.rb

@@ -291,8 +291,13 @@ module Pod
             url = 'https://sourceforge.org/Artsy/Specs.git'
             Pathname.any_instance.stubs(:exist?).
               returns(true).then.returns(false)
-            @sources_manager.send(:name_for_url, url).
-              should == 'sourceforge-artsy-1'
+            @sources_manager.send(:name_for_url, url).should == 'sourceforge-artsy-1'
+
+            url = 'https://sourceforge.org/Artsy/Specs.git'
+            Pathname.any_instance.stubs(:exist?).
+              returns(true).then.
+              returns(true).then.returns(false)
+            @sources_manager.send(:name_for_url, url).should == 'sourceforge-artsy-2'
           end
         end