Pin microshift build for openshift-4.18 ec.4

[openshift-bot]

Created by job run https://art-jenkins.apps.prod-stable-spoke1-dc-iad2.itup.redhat.com/job/aos-cd-builds/job/build%252Fbuild-microshift/1407

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[openshift-bot]

Validating 1 file(s)...
Traceback (most recent call last):
File "/usr/local/bin/validate-ocp-build-data", line 33, in
sys.exit(load_entry_point('rh-ocp-build-data-validator==0.2.5', 'console_scripts', 'validate-ocp-build-data')())
File "/usr/local/lib/python3.9/site-packages/validator/main.py", line 87, in main
validate(f, args.exclude_vpn, args.schema_only)
File "/usr/local/lib/python3.9/site-packages/validator/main.py", line 11, in validate
(parsed, err) = format.validate(open(file).read())
FileNotFoundError: [Errno 2] No such file or directory: 'releases.yml'