PEP 440: Update regex from packaging project (#3288)

Update regex from packaging project

See pypa/packaging#705

Co-authored-by: Hugo van Kemenade <hugovk@users.noreply.github.com>

Author: RazerM

peps/pep-0440.rst

@@ -1625,7 +1625,7 @@ project)::
             (?P<release>[0-9]+(?:\.[0-9]+)*)                  # release segment
             (?P<pre>                                          # pre-release
                 [-_\.]?
-                (?P<pre_l>(a|b|c|rc|alpha|beta|pre|preview))
+                (?P<pre_l>alpha|a|beta|b|preview|pre|c|rc)
                 [-_\.]?
                 (?P<pre_n>[0-9]+)?
             )?