[7.17] Revert "Update to Go 1.21.6 (#37694)"

[cmacknz]

This reverts commit c298cea.

The 7.17.18 is being pulled forward before Go 1.20 will officially be deprecated, and well before the corresponding 8.x release that will first release with Go 1.21.

This needs to be reverted because Go 1.21 drops support for Windows 8.1 and we do not want this to happen in the LTS 7.17 branch sooner than it needs to.

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[cmacknz]

/package

[cmacknz]

Latest packaging job passed but wasn't updated here, merging

https://beats-ci.elastic.co/blue/organizations/jenkins/Beats%2Fpackaging/detail/PR-37820/4/pipeline