Enhancement: Update go module version to v8

[ghost]

Proposed commit message

The go module require version that matches release version
beats used to updated version in this issue
#15853
But forget to update to v8

Checklist

• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have made corresponding change to the default configuration files
• I have added tests that prove my fix is effective or that my feature works

[cla-checker-service]

❌ Author of the following commits did not sign a Contributor Agreement:
4d9d8f2

Please, read and sign the above mentioned agreement if you want to contribute to this project

[mergify]

This pull request does not have a backport label.
If this is a bug or security fix, could you label this PR @maxmeng-oss? 🙏.
For such, you'll need to label your PR with:

• The upcoming major version of the Elastic Stack
• The upcoming minor version of the Elastic Stack (if you're not pushing a breaking change)

To fixup this pull request, you need to add the backport labels for the needed
branches, such as:

• backport-v8./d.0 is the label to automatically backport to the 8./d branch. /d is the digit

[elasticmachine]

❕ Build Aborted

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Build stats

• Start Time: 2024-02-08T07:21:21.302+0000

• Duration: 5 min 38 sec

Steps errors

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Load a resource file from a library

• Took 0 min 0 sec . View more details here
• Description: approval-list/elastic/beats.yml

Error signal

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• Description: githubApiCall: The REST API call https://api.github.com/orgs/elastic/members/maxmeng-oss return the message : java.lang.Exception: httpRequest: Failure connecting to the service https://api.github.com/orgs/elastic/members/maxmeng-oss : httpRequest: Failure connecting to the service https://api.github.com/orgs/elastic/members/maxmeng-oss : Code: 404Error: {"message":"User does not exist or is not a member of the organization","documentation_url":"https://docs.github.com/rest/orgs/members#check-organization-membership-for-a-user"}

🤖 GitHub comments

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

• /test : Re-trigger the build.

• /package : Generate the packages and run the E2E tests.

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[elasticmachine]

Pinging @elastic/elastic-agent (Team:Elastic-Agent)

[pierrehilbert]

Hello,
Thanks for contributing.
Could you please sign our contributor agreement?

[ghost]

I had assign a personal CLA, switch to my personal account to re-submit