Fix error message when trying to install TruffleRuby on Windows

v1.62.1

Fix error message when trying to install truffleruby on windows

Automatically install libxml2-dev libxslt-dev on TruffleRuby if needed with bundler-cache: true

• This is a special case, because TruffleRuby needs an extra system dependency that other Rubies do not, and GitHub runners do not have these packages installed by default, while TravisCI has them.

Install specific bundler version when exact version is given

Fixes #138

Add Ruby 3.0.0 on Windows

v1.61.1

Ensure no \r are added when running generate-windows-versions.rb on W…

Add Ruby 3.0.0

v1.61.0

Add Ruby 3.0.0

Fix caching for gemfile under sub-directory

• Fixes #131

Add Ruby 3.0.0-rc1

v1.60.0

Add 3.0.0-rc1

Fix cache saving on Windows and add jruby-9.2.14.0

Fixes #102

Support a specific version for the bundler input, and use the exact Bundler version from the lockfile if provided

• Fixes #123

Only set $BUNDLER_VERSION when needed

• Fixes #122