[ruby/pathname] Remove check for File.birthtime
File.birthtime has existed since Ruby 2.2, and pathname requires Ruby
= 2.7.0, so the method will always be there.
https://github.com/ruby/pathname/commit/aca9613bbf
Added by peterzhu2118 (Peter Zhu) over 1 year ago
[ruby/pathname] Remove check for File.birthtime
File.birthtime has existed since Ruby 2.2, and pathname requires Ruby
https://github.com/ruby/pathname/commit/aca9613bbf