bump(download): Flannel v0.27.3 → v0.28.4

[karimzakzouk]

What type of PR is this?

/kind feature

What this PR does / why we need it:
Bump Flannel from v0.27.3 to v0.28.4, the latest stable release. Includes bug fixes and improvements for better networking stability.

Which issue(s) this PR fixes:
Fixes #13182

Special notes for your reviewer:
Only flannel_version updated. Please advise if flannel_cni_version also needs bumping.

Does this PR introduce a user-facing change?:

Bump Flannel to v0.28.4

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: karimzakzouk
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[k8s-ci-robot]

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[k8s-triage-robot]

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[yankay]

/ok-to-test