Update docker.elastic.co/ci-agent-images/ems/buildkite-agent-node20 Docker tag to v0.5

[elastic-renovate-prod[bot]]

This PR contains the following updates:

Package	Update	Change
docker.elastic.co/ci-agent-images/ems/buildkite-agent-node20 (source)	minor	0.4 -> 0.5

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This PR has been generated by Renovate Bot.

[jsanz]

💚 All backports created successfully

Status	Branch	Result
✅	feature-layers

Questions ?

Please refer to the Backport tool documentation