update elastic/beats in go.mod once v8.0.0 has been released

[michel-laterman]

PR #970 updated the go.mod file to an untagged commit on the 8.0 branch to allow fleet-server to use up to date code from libbeat (specifically new ca fingerprint handling).

Once v8.0.0 has been released and tagged we should set our go.mod to refer to this version.

[michel-laterman]

Currently the go.mod of the beats repo is set to have the v7 major version. go detects incompatible major versions when trying to update to v8.x. We will not be able to use a tagged version of the beats module unless the module is updated to point provide v8 paths.

An alternative solution is to change the beats import to use https://github.com/elastic/elastic-agent-libs

[ph]

Yes, the data plane have looked at moving to v8, but that decided the number of changes didn't worth the risk. So we will run off a commit for a long time.

[ph]

See this elastic/beats#31213 (comment) I will close this issue.