Update to 0.300005

Upstream changes:
0.300005  2021-01-26 15:57:41-05:00 America/New_York

    [ BUG FIXES ]
    * GH #1546: Add MIME type for all files served from public (Russell
      @veryrusty Jenkins)
    * GH #1555: Remove all leftovers of warnings config setting (Sergiy
      Borodych)
    * GH #1557: Remove HTTP::XSCookies workaround (Alexander Pankoff)
    * GH #1564: Add script_name to redirects beginning with / (Nigel Gregoire)
    * GH #1567: Fix CSS so errors do not display ourside of <pre> HTML
      element (Elliot Holden)
    * GH #1568: Serializer::Mutable doesn't auto-load other serializers
      (Russell @veryrusty Jenkins)
    * GH #1579: Fix missing push_header method in Response::Delayed
      (Paul Clements)

    [ ENHANCEMENTS ]
    * GH #1552: Update jQuery (Sergiy Borodych)
    * GH #1558: Test to make sure uploads aren't discarded after the
      forward keyword is used (Alexander Pankoff)
    * GH #1571: Add GitHub Actions support (Gabor Szabo)
    * GH #1572: Install Dancer2::Session::Cookie in order to run the test
      t/issues/gh-811.t (racke)

    [ DOCUMENTATION ]
    * GH #1490: Document Dancer2::Core::App->template() (Steve Dondley)
    * GH #1551: Fix pod for cookie same site attribute (Sergiy Borodych)
    * GH #1562: Fix links, missing code in Tutorial (cloveistaken)

(wen)