Revert "[7.17](backport #23872) [packaging] Bump golang-crossbuild version debian8"

[v1v]

Reverts #29686

[botelastic]

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[v1v]

/package

[elasticmachine]

💚 Build Succeeded

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• Reason: null

• Start Time: 2022-02-03T16:57:35.269+0000

• Duration: 143 min 29 sec

• Commit: c7c26b5

Test stats 🧪

Test	Results
Failed	0
Passed	34043
Skipped	3790
Total	37833

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Tests succeeded.

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[v1v]

/test

[v1v]

As agreed let's revert this in 7.17

[v1v]

Failures unrelated to the nature of this change, so I'll proceed and merge this now