[8.6](backport #1841) actions: use go-version-file: .go-version

[mergify]

This is an automatic backport of pull request #1841 done by Mergify.

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More conditions and actions can be found in the documentation.

You can also trigger Mergify actions by commenting on this pull request:

• @Mergifyio refresh will re-evaluate the rules
• @Mergifyio rebase will rebase this PR on its base branch
• @Mergifyio update will merge the base branch into this PR
• @Mergifyio backport <destination> will backport this PR on <destination> branch

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Finally, you can contact us on https://mergify.com

[elasticmachine]

💚 Build Succeeded

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Build stats

• Start Time: 2022-11-30T14:35:09.034+0000

• Duration: 17 min 40 sec

Test stats 🧪

Test	Results
Failed	0
Passed	4613
Skipped	13
Total	4626

💚 Flaky test report

Tests succeeded.

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To re-run your PR in the CI, just comment with:

• /test : Re-trigger the build.

• /package : Generate the packages.

• run integration tests : Run the Elastic Agent Integration tests.

• run end-to-end tests : Generate the packages and run the E2E Tests.

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[elasticmachine]

🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	98.333% (59/60)	👍
Files	69.082% (143/207)	👍
Classes	69.133% (271/392)	👍
Methods	53.8% (814/1513)	👍
Lines	38.976% (8791/22555)	👎 -0.027
Conditionals	100.0% (0/0)	💚