Update Helm release filebeat to v8

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
filebeat	fleet	major	^7.16.2 -> ^8.0.0

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Release Notes

elastic/helm-charts (filebeat)

v8.5.1

Compare Source

• 8.5.1 as default version
• See the Breaking changes for a detailed list of changes.
• Thanks for everyone that contributed to this release, especially @​framsouza, @​jmlrt,@​ebuildy, @​pjaak, @​azasypkin,@​jbudz,@​jkakavas, @​mark-vieira, @​mgreau, @​nkammah, @​pugnascotia, @​rjernst, and everyone else who wasn't mentionned here...

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Configuration

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