.github/dependabot.yml - Revert team based segmentation

[andrewkroh]

Proposed commit message

Dependabot does not allow multiple configurations for a given Go module. So this reverts the change to segment the configuration along team boundaries with explicit team-based reviewer requirements. It was complaining about

The property '#/updates/1' is a duplicate. Update configs must have a unique combination of 'package-ecosystem', 'directory', and 'target-branch'
The property '#/updates/2' is a duplicate. Update configs must have a unique combination of 'package-ecosystem', 'directory', and 'target-branch'

as pointed out in #36158 (comment).

[mergify]

This pull request does not have a backport label.
If this is a bug or security fix, could you label this PR @andrewkroh? 🙏.
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]

Pinging @elastic/elastic-agent-data-plane (Team:Elastic-Agent-Data-Plane)

[elasticmachine]

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• Start Time: 2023-08-16T15:10:58.920+0000

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