(MAINT) Gemspec explicit file declarations

Prior to this commit spec.files used git to collect the required files
for the gem. This would pull in everything that had been checked in to
git.

We can actually be a little bit more explicit here. This commit updates
spec.files to contain a known list of files to include in the gem.

.github/workflows/ci.yml

@@ -15,8 +15,6 @@ jobs:
       fail-fast: false
       matrix:
         os:
-          - "windows-latest"
-          - "windows-2019"
           - "ubuntu-latest"
         ruby:
           - 2.5

ruby-pwsh.gemspec

@@ -18,7 +18,6 @@ Gem::Specification.new do |spec|
   # Prevent pushing this gem to RubyGems.org. To allow pushes either set the 'allowed_push_host'
   # to allow pushing to a single host or delete this section to allow pushing to any host.
   if spec.respond_to?(:metadata)
-
     spec.metadata['homepage_uri'] = spec.homepage
     spec.metadata['source_code_uri'] = 'https://github.com/puppetlabs/ruby-pwsh'
     spec.metadata['changelog_uri'] = 'https://github.com/puppetlabs/ruby-pwsh'
@@ -27,11 +26,14 @@ Gem::Specification.new do |spec|
       'public gem pushes.'
   end
 
-  # Specify which files should be added to the gem when it is released.
-  # The `git ls-files -z` loads the files in the RubyGem that have been added into git.
-  spec.files = Dir.chdir(File.expand_path(__dir__)) do
-    `git ls-files -z`.split("\x0").reject { |f| f.match(%r{^(test|spec|features)/}) }
-  end
+  spec.files = Dir[
+    'README.md',
+    'LICENSE',
+    '.rubocop.yml',
+    'lib/**/*',
+    'bin/**/*',
+    'spec/**/*',
+  ]
 
   spec.bindir        = 'exe'
   spec.executables   = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }

spec/unit/pwsh_spec.rb

@@ -401,14 +401,11 @@ def close_stream(stream, style = :inprocess)
 
       context 'it should handle UTF-8' do
         # different UTF-8 widths
-        # rubocop:disable Style/AsciiComments
         # 1-byte A
         # 2-byte ۿ - http://www.fileformat.info/info/unicode/char/06ff/index.htm - 0xDB 0xBF / 219 191
         # 3-byte ᚠ - http://www.fileformat.info/info/unicode/char/16A0/index.htm - 0xE1 0x9A 0xA0 / 225 154 160
         # 4-byte 𠜎 - http://www.fileformat.info/info/unicode/char/2070E/index.htm - 0xF0 0xA0 0x9C 0x8E / 240 160 156 142
         let(:mixed_utf8) { "A\u06FF\u16A0\u{2070E}" } # Aۿᚠ𠜎
-        # rubocop:enable Style/AsciiComments
-
         it 'when writing basic text' do
           code = "Write-Output '#{mixed_utf8}'"
           result = manager.execute(code)