ci: update regex for new cilium images

[jpayne3506]

Reason for Change:

Previous regex logic did not match with the additional -###### that is a part of the new cilium images.

Issue Fixed:

Requirements:

• [x] uses conventional commit messages
• [ ] includes documentation
• [ ] adds unit tests
• [x] relevant PR labels added

Notes:

[jpayne3506]

/azp run Azure Container Networking PR

[azure-pipelines[bot]]

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