Log Message:
Update OpenDNSSEC version 2 to 2.1.9.

Upstream changes:

OpenDNSSEC 2.1.9 - 2021-05-03

* OPENDNSSEC-955: Prevent concurrency between C_Login/C_OpenSession and
  C_FindObject in PKCS#11 operations as some HSMs do not like this and
  the key may (transiently) not be available.
* OPENDNSSEC-956: Harden the signing procedure to still sign zones for
  which there are unused keys specified in the signconf.  These are
  included by the enforcer because there may be (outdated) signatures
  for them, but the signer doesn't need this reference anymore in 2.1.
  However this was left in for backwards compatibility (probably).