gnupg: upgrade 2.4.0 -> 2.4.2

Stable version update

Noteworthy changes in version 2.4.2
===================================

  * gpg: Print a warning if no more encryption subkeys are left over
    after changing the expiration date.  [rGef2c3d50fa]

  * gpg: Fix searching for the ADSK key when adding an ADSK.  [T6504]

  * gpgsm: Speed up key listings on Windows.  [rG08ff55bd44]

  * gpgsm: Reduce the number of "failed to open policy file"
    diagnostics.  [rG68613a6a9d]

  * agent: Make updating of private key files more robust and track
    display S/N.  [T6135]

  * keyboxd: Avoid longish delays on Windows when listing keys.
    [rG6944aefa3c]

  * gpgtar: Emit extra status lines to help GPGME.  [T6497]

  * w32: Avoid using the VirtualStore.  [T6403]

Signed-off-by: Alexander Kanavin <alex@linutronix.de>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit c9eddfde)
Signed-off-by: Steve Sakoman <steve@sakoman.com>