Extend key ID matching to expired keys

gpg accepts signatures with expired keys as long as the signature was
made prior to key expiration. But it also changes the status-fd output
format that we grep for the expected key ID. Make sure we look for the
alternate EXPKEYSIG line in the output in that case to find the key ID.

autospec/specfiles.py

@@ -444,7 +444,7 @@ def write_prep(self):
             self._write_strip("chmod 700 .gnupg")
             self._write_strip(f"gpg --homedir .gnupg --import {self.config.pkey_macro}")
             self._write_strip(f"gpg --homedir .gnupg --status-fd 1 --verify {self.config.signature_macro} %{{SOURCE0}} > gpg.status")
-            self._write_strip(f"grep '^\\[GNUPG:\\] GOODSIG {self.keyid}' gpg.status")
+            self._write_strip(f"grep -E '^\\[GNUPG:\\] (GOODSIG|EXPKEYSIG) {self.keyid}' gpg.status")
         self.write_prep_prepend()
         prefix = self.content.prefixes[self.url]
         if self.config.default_pattern == 'R':