ci/hermetic: specify openshift-client version

We need to specify a version for Renovate to update it. While bumping
that version, Renovate will also update the checksum (see [1]).

[1] https://issues.redhat.com/browse/KFLUXSPRT-3976

Author: joelcapitao

ci/hermetic/artifacts.lock.yaml

@@ -1,15 +1,15 @@
 metadata:
   version: '1.0'
 artifacts:
-  - download_url: 'https://mirror.openshift.com/pub/openshift-v4/x86_64/clients/ocp/latest/openshift-client-linux.tar.gz'
-    checksum: 'sha256:ee95462864b988040da09613d5aa691c1d3576813b532d2fcec1e67ccbb4164a'
+  - download_url: 'https://mirror.openshift.com/pub/openshift-v4/x86_64/clients/ocp/4.19.1/openshift-client-linux-4.19.1.tar.gz'
+    checksum: 'sha256:546ea80a6670b0338b05d9babaf2791ddc9c219411f67e76ec5c41de98e9fefb'
     filename: 'openshift-client-linux-x86_64.tar.gz'
-  - download_url: 'https://mirror.openshift.com/pub/openshift-v4/s390x/clients/ocp/latest/openshift-client-linux.tar.gz'
+  - download_url: 'https://mirror.openshift.com/pub/openshift-v4/s390x/clients/ocp/4.19.1/openshift-client-linux-4.19.1.tar.gz'
     checksum: 'sha256:516e7dd49806a0664177c04473ac2991d1ada53d28501c552135e7abe86043e5'
     filename: 'openshift-client-linux-s390x.tar.gz'
-  - download_url: 'https://mirror.openshift.com/pub/openshift-v4/ppc64le/clients/ocp/latest/openshift-client-linux.tar.gz'
+  - download_url: 'https://mirror.openshift.com/pub/openshift-v4/ppc64le/clients/ocp/4.19.1/openshift-client-linux-4.19.1.tar.gz'
     checksum: 'sha256:49bd2d47add43270f936246bd8eb57123cde8e16e823180f2ad7589e9f480657'
     filename: 'openshift-client-linux-ppc64le.tar.gz'
-  - download_url: 'https://mirror.openshift.com/pub/openshift-v4/aarch64/clients/ocp/latest/openshift-client-linux.tar.gz'
+  - download_url: 'https://mirror.openshift.com/pub/openshift-v4/aarch64/clients/ocp/4.19.1/openshift-client-linux-4.19.1.tar.gz'
     checksum: 'sha256:546ea80a6670b0338b05d9babaf2791ddc9c219411f67e76ec5c41de98e9fefb'
     filename: 'openshift-client-linux-aarch64.tar.gz'