Commit Gemfile.lock for reproducible tests

Addressed a syntax error in the thrift.gemspec, and committed
Gemfile.lock files for both the gem and tests. Gems source switched
to https://rubygems.org.

This is a strongly recommended approach according to the Bundler team:

> As a result, you SHOULD check your Gemfile.lock into version control,
> in both applications and gems. If you do not, every machine that
> checks out your repository (including your production server) will
> resolve all dependencies again, which will result in different
> versions of third-party code being used if any of the gems in the
> Gemfile(5) or any of their dependencies have been updated.
https://bundler.io/man/bundle-install.1.html#THE-GEMFILE-LOCK

Also helps with Dependabot, which will be able to bump the lock file,
while we can relax version requirements in the gemspec.
diff --git a/lib/rb/thrift.gemspec b/lib/rb/thrift.gemspec
index 744d078..288cc11 100644
--- a/lib/rb/thrift.gemspec
+++ b/lib/rb/thrift.gemspec
@@ -26,7 +26,7 @@
 
   s.require_paths = %w[lib ext]
 
-  s.add_development_dependency 'bundler',            '~> 2.2.33"
+  s.add_development_dependency 'bundler',            '~> 2.2.34'
   s.add_development_dependency 'pry',                '~> 0.11.3'
   s.add_development_dependency 'pry-byebug',         '~> 3.6'
   s.add_development_dependency 'pry-stack_explorer', '~> 0.4.9.2'
@@ -37,4 +37,3 @@
   s.add_development_dependency 'srv',                '~> 1.0'
   s.add_development_dependency 'thin',               '~> 1.7'
 end
-