The 'not valid after' date was set to the last day of 9999 which the
date time parser could not handle. Set the expiry year to 2050 and
regenerate keys with length of 3072 bits instead of 2048 bits.
Fixes: QTBUG-129504
Change-Id: Iaede785264c1d31b021ccabc9d1aaf949c8922f2
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
(cherry picked from commit a5364a279e9ed9bc69a13698f9b43dbe36d0a326)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>