Bump logstash version 9.4.0

[github-actions]

What

Update logstash version

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Update logstash version files

Update logstash version in versions.yml

change detected: * key "$.logstash" updated from "9.3.0" to "9.4.0", in file "versions.yml"

Update logstash-core version in versions.yml

change detected: * key "$.logstash-core" updated from "9.3.0" to "9.4.0", in file "versions.yml"

GitHub Action workflow link

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[mergify]

This pull request does not have a backport label. Could you fix it @github-actions[bot]? 🙏
To fixup this pull request, you need to add the backport labels for the needed
branches, such as:

• backport-8./d is the label to automatically backport to the 8./d branch. /d is the digit.
• If no backport is necessary, please add the backport-skip label

[donoghuc]

cc @mashhur

[elasticmachine]

💛 Build succeeded, but was flaky

• Buildkite Build
• Commit: c249c28

Failed CI Steps

• :rspec: Ruby unit tests

[mashhurs]

Thank you alot