[Automation] Bump Golang version to 1.20.7

[apmmachine]

Bump golang-version to latest version

Update .go-version

Updated to content "1.20.6" in file ".go-version"

1.20.6

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

1.20.7

no GitHub Release found for go1.20.7 on "https://github.com/golang/go"

Update .golangci.yml

Updated to content "1.20.6" in file ".golangci.yml"

1.20.6

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

1.20.7

no GitHub Release found for go1.20.7 on "https://github.com/golang/go"

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[elasticmachine]

💚 Build Succeeded

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Build stats

• Start Time: 2023-08-14T19:47:47.117+0000

• Duration: 39 min 59 sec

Test stats 🧪

Test	Results
Failed	0
Passed	751
Skipped	1
Total	752

💚 Flaky test report

Tests succeeded.

🤖 GitHub comments

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

• /test : Re-trigger the build.

[juliaElastic]

/test

[cmacknz]

The tests are failing because of testcontainers/testcontainers-go#1359