Log Message:
gpgme: update to 1.20.0.

Noteworthy changes in version 1.20.0 (2023-04-20)
-------------------------------------------------

 * On Windows, the gettext functions provided by gpgrt are switched
   into utf8 mode, so that all localized texts returned by GpgME or
   gpgrt, e.g. the texts for error codes are now UTF-8 encoded.
   [T5960]

 * Key::canSign now returns false for OpenPGP keys without signing
   (sub)key.  [T6456]

 * The new macOS Homebrew location is now by default supported.
   [T6440]

 * Fix regression in 1.19.0.  [rMb608c084b9]

 * Fix invocation of gpgtar on Windows.  [rM0c29119e06]