livecheck/pypi: minor edit to PyPI post version

Library/Homebrew/livecheck/strategy/pypi.rb

@@ -50,7 +50,7 @@ module Homebrew
           # Example regex: `%r{href=.*?/packages.*?/example[._-]v?(\d+(?:\.\d+)*).t}i`.
           regex ||=
             %r{href=.*?/packages.*?/#{Regexp.escape(package_name)}[._-]
-               v?(\d+(?:\.\d+)*(.post\d)?)#{Regexp.escape(suffix)}}ix
+               v?(\d+(?:\.\d+)*(.post\d+)?)#{Regexp.escape(suffix)}}ix
 
           Homebrew::Livecheck::Strategy::PageMatch.find_versions(page_url, regex)
         end