[8.10]Updating elastic-autodiscovery version to 0.6.4

[gizas]

Related to elastic/elastic-agent@539bef4.

Aligning elastic-autodiscovery library version with elastic-agent repo to 0.6.4

Proposed commit message

• WHAT: Upgrade Elastic-autodiscovery library version to 0.6.4
• WHY: Keep it the same with elastic-agent in order to apply latest workaround

Checklist

• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have made corresponding change to the default configuration files
• I have added tests that prove my fix is effective or that my feature works
• I have added an entry in CHANGELOG.next.asciidoc or CHANGELOG-developer.next.asciidoc.

Related issues

• Relates #Disable Deployment and Replicaset enrichment by default elastic-agent-autodiscover#62
• Relates #https://github.com/elastic/sdh-beats/issues/3863

[elasticmachine]

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