Update rake due to CVE-2020-8130

Author: timocp

ruby-calc.gemspec

@@ -8,7 +8,7 @@ Gem::Specification.new do |spec|
   spec.name          = "ruby-calc"
   spec.version       = Calc::VERSION
   spec.authors       = ["Tim Peters"]
-  spec.email         = ["zomg.tim@gmail.com"]
+  spec.email         = ["tim@catminion.net"]
 
   spec.summary       = "Ruby bindings for calc"
   spec.description   = "Ruby bindings for calc, an arbitrary precision maths library.  Provides " \
@@ -24,7 +24,7 @@ Gem::Specification.new do |spec|
   spec.required_ruby_version = "~> 2.0"
 
   spec.add_development_dependency "bundler", "~> 1.8"
-  spec.add_development_dependency "rake", "~> 10.0"
+  spec.add_development_dependency "rake", "~> 12.3.3"
   spec.add_development_dependency "rake-compiler", "~> 0"
   spec.add_development_dependency "minitest", "~> 5.8", ">= 5.8.2"
   spec.add_development_dependency "yard", "~> 0.9.11"