bump aws-efa-k8s-device-plugin to v0.5.21-eksbuild.9

[cdirubbio]

Issue

Description of changes

Bumping aws-efa-k8s-device-plugin to newest version v0.5.21-eksbuild.9

Checklist

• Added/modified documentation as required (such as the README.md for modified charts)
• Incremented the chart version in Chart.yaml for the modified chart(s)
• Manually tested. Describe what testing was done in the testing section below
• Make sure the title of the PR is a good description that can go into the release notes

Testing

     NAME: efa-test
     LAST DEPLOYED: Fri Aug 21 12:32:48 2026
     NAMESPACE: efa-test
     STATUS: deployed
     REVISION: 1
     DESCRIPTION: Install complete
     TEST SUITE: None
     NOTES:
     EFA device plugin is installed, it can be requested as `vpc.amazonaws.com/efa` resource.

Image pulls, this is just crashloop bc nodes are c5.large and dont actually have efas.

eks-charts on  master on ☁️  (us-east-1) ➜  kgp -n efa-test
NAME                                       READY   STATUS      RESTARTS      AGE
efa-test-aws-efa-k8s-device-plugin-5dvkw   0/1     Completed   2 (26s ago)   32s
efa-test-aws-efa-k8s-device-plugin-dlk86   0/1     Completed   2 (26s ago)   32s

eks-charts on  master on ☁️  (us-east-1) ➜  k logs -n efa-test efa-test-aws-efa-k8s-device-plugin-5dvkw
W0821 19:35:01.478390       1 mappings.go:82] Instance type c5.large is not EFA enabled
2026/08/21 19:35:01 Fetching EFA devices.
2026/08/21 19:35:01 Error to get IB device: %v. No valid EFA devices found

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.