gpgme: update to version 1.18.0

gpgme: update to version 1.18.0

 Noteworthy changes in version 1.18.0 (2022-08-10)
 -------------------------------------------------

 * New keylist mode to force refresh via external methods.  [T5951]
 * The keylist operations now create an import result to report the
   result of the locate keylist modes.  [T5951]
 * core: Return BAD_PASSPHRASE error code on symmetric decryption
   failure.  [T5939]
 * cpp, qt: Do not export internal symbols anymore.  [T5906]
 * cpp, qt: Support revocation of own OpenPGP keys.  [T5904]
 * qt: The file name of (signed and) encrypted data can now be set.  [T6056]
 * cpp, qt: Support setting the primary user ID.  [T5938]
 * python: Fix segv(NULL) when inspecting contect after exeception.  [T6060]

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
(cherry picked from commit 00bfb4f151d80e8e6f7b860d423ef1fa8c926251)