NE-2760: Update base image references to 5.0 for DEFAULT:PQ crypto-policy

[davidesalerno]

Summary

• Update Dockerfile.ocp builder image from rhel-9-golang-1.25-openshift-4.22 to rhel-9-golang-1.26-openshift-5.0
• Update Dockerfile.ocp base image from ocp/4.22:base-rhel9 to ocp/5.0:base-rhel9
• Update .ci-operator.yaml build root tag to rhel-9-release-golang-1.26-openshift-5.0

The 5.0 base image includes the DEFAULT:PQ crypto-policy configuration from openshift/images#230, enabling post-quantum cryptography support.

Related: #190

Test plan

• CI e2e tests pass with updated base image
• Verify coredns binary runs correctly on the new base image with DEFAULT:PQ policy

🤖 Generated with Claude Code

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[openshift-ci-robot]

@davidesalerno: This pull request references NE-2760 which is a valid jira issue.

Warning: The referenced jira issue has an invalid target version for the target branch this PR targets: expected the story to target the "5.0.0" version, but no target version was set.

Details

In response to this:

Summary

• Update Dockerfile.ocp builder image from rhel-9-golang-1.25-openshift-4.22 to rhel-9-golang-1.26-openshift-5.0
• Update Dockerfile.ocp base image from ocp/4.22:base-rhel9 to ocp/5.0:base-rhel9
• Update .ci-operator.yaml build root tag to rhel-9-release-golang-1.26-openshift-5.0

The 5.0 base image includes the DEFAULT:PQ crypto-policy configuration from openshift/images#230, enabling post-quantum cryptography support.

Related: #190

Test plan

• CI e2e tests pass with updated base image
• Verify coredns binary runs correctly on the new base image with DEFAULT:PQ policy

🤖 Generated with Claude Code

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