Update expiration on karels@freebsd.org gpg key.

Contents produced by addkey.sh.

share/pgpkeys/karels.key

@@ -3,10 +3,10 @@
 sh addkey.sh karels 8CCF69ECC5CF284F ;
 -->
 <programlisting xmlns="http://docbook.org/ns/docbook" role="pgpfingerprint"><![CDATA[
-pub   rsa2048/8CCF69ECC5CF284F 2016-06-16 [SC] [expires: 2019-06-16]
+pub   rsa2048/8CCF69ECC5CF284F 2016-06-16 [SC] [expires: 2022-08-31]
       Key fingerprint = EAB9 5249 B48A A991 130D  6746 8CCF 69EC C5CF 284F
 uid                            Michael Karels <karels@freebsd.org>
-sub   rsa2048/B4CE5C0549FFC668 2016-06-16 [E] [expires: 2019-06-16]
+sub   rsa2048/B4CE5C0549FFC668 2016-06-16 [E] [expires: 2022-08-31]
 
 ]]></programlisting>
 <programlisting xmlns="http://docbook.org/ns/docbook" role="pgpkey"><![CDATA[
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+=E/D3
 -----END PGP PUBLIC KEY BLOCK-----
 ]]></programlisting>