Pin microshift build for openshift-4.16 4.16.26 (#5791)

Created by job run https://art-jenkins.apps.prod-stable-spoke1-dc-iad2.itup.redhat.com/job/aos-cd-builds/job/build%252Fbuild-microshift/1461

Co-authored-by: AOS Automation Release Team <noreply@redhat.com>

releases.yml

@@ -19,7 +19,12 @@ releases:
         upgrades: 4.15.18,4.15.19,4.15.20,4.15.21,4.15.22,4.15.23,4.15.24,4.15.25,4.15.26,4.15.27,4.15.28,4.15.29,4.15.30,4.15.31,4.15.32,4.15.33,4.15.34,4.15.35,4.15.36,4.15.37,4.15.38,4.15.39,4.15.40,4.16.0,4.16.1,4.16.2,4.16.3,4.16.4,4.16.5,4.16.6,4.16.7,4.16.8,4.16.9,4.16.10,4.16.11,4.16.12,4.16.13,4.16.14,4.16.15,4.16.16,4.16.17,4.16.18,4.16.19,4.16.20,4.16.21,4.16.23,4.16.24,4.16.25
       members:
         images: []
-        rpms: []
+        rpms:
+        - distgit_key: microshift
+          why: Pin microshift to assembly
+          metadata:
+            is:
+              el9: microshift-4.16.26-202412051029.p0.gf41e7be.assembly.4.16.26.el9
       rhcos:
         rhel-coreos:
           images: