p5-CGI: update to 4.50.

4.50 2019-06-22

    [ ENHANCEMENT ]
    - Add APPEND_QUERY_STRING option (GH #243, thanks to stevenh)

4.49 2020-06-08

    [ FIX ]
    - remove deprecation warning as no longer in core (GH #221)

4.48 2020-06-02

    [ FIX ]
    - fix CGI::Cookie->bake() doesn't work with mod_perl redirects (GH #240)
    - thanks to sherrardb for the PR (GH #241)

(wiz)