[Automation] Bump Golang version to 1.20.6

[ghost]

See changelog for 1.20.6

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Bump golang-version to latest version

Update go version 1.20.6

ran shell command ".ci/bump-go-release-version.sh 1.20.6"

1.20.6

no GitHub Release found for go1.20.6 on "https://github.com/golang/go"

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[elasticmachine]

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• Start Time: 2023-07-25T08:06:08.657+0000

• Duration: 64 min 56 sec

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