Rename gemspec and fix CI

Author: antstorm

.github/workflows/ci.yml

@@ -66,4 +66,4 @@ jobs:
       - name: Package and install the gem
         run: |
           gem build temporal.gemspec
-          gem install $(echo temporal-ruby-*.gem)
+          gem install $(echo temporalio-*.gem)

temporal.gemspec renamed to temporalio.gemspec

@@ -17,7 +17,7 @@ Gem::Specification.new do |spec|
   spec.files =
     Dir['lib/**/*.*'] +
     Dir['bridge/**/*.*'].reject { |x| x.include?('/target/') } +
-    %w[ext/Rakefile temporal.gemspec Gemfile LICENSE README.md]
+    %w[ext/Rakefile temporalio.gemspec Gemfile LICENSE README.md]
 
   spec.required_ruby_version = '>= 2.7.0'