build(deps): bump github.com/elastic/elastic-transport-go/v8 from 8.3…

….0 to 8.4.0 (#3349)

* build(deps): bump github.com/elastic/elastic-transport-go/v8

Bumps [github.com/elastic/elastic-transport-go/v8](https://github.com/elastic/elastic-transport-go) from 8.3.0 to 8.4.0.
- [Commits](elastic/elastic-transport-go@v8.3.0...v8.4.0)

---
updated-dependencies:
- dependency-name: github.com/elastic/elastic-transport-go/v8
  dependency-type: indirect
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

* run make check and update NOTICE.txt file

---------

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: julienlind <vincent.lind@elastic.co>