[Automation] Bump Golang version to 1.20.8

[apmmachine]

See changelog for 1.20.8

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Bump golang-version to latest version

Update .go-version

1 file(s) updated with "1.20.8": * .go-version

1.20.8

no GitHub Release found for go1.20.8 on "https://github.com/golang/go"

Update .golangci.yml

1 file(s) updated with "1.20.8": * .golangci.yml

1.20.8

no GitHub Release found for go1.20.8 on "https://github.com/golang/go"

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[elasticmachine]

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• Start Time: 2023-09-09T20:01:35.416+0000

• Duration: 21 min 18 sec

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