beats dependabot: for GitHub actions

Proposed commit message

WHAT: dependabot: for GitHub actions
WHY: keep the CI secured

Implementation details

Run weekly and produce up to 5 PRs that can be grouped - this will help the noise of several PRs but knowing those dependencies upgrade will be requested to be reviewed at the beginning of the week

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
[ ] I have added an entry in CHANGELOG.next.asciidoc or CHANGELOG-developer.next.asciidoc.

Author's Checklist

[ ]

How to test this PR locally

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Mar 05 '24 08:03 v1v

This pull request does not have a backport label. If this is a bug or security fix, could you label this PR @v1v? 🙏. 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

Mar 05 '24 08:03 mergify[bot]

:green_heart: Build Succeeded

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Build stats

Start Time: 2024-03-06T08:28:12.230+0000
Duration: 13 min 58 sec

Test stats :test_tube:

Test	Results
Failed	0
Passed	3
Skipped	0
Total	3

:green_heart: Flaky test report

Tests succeeded.

:robot: 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.
/beats-tester : Run the installation tests with beats-tester.
run elasticsearch-ci/docs : Re-trigger the docs validation. (use unformatted text in the comment!)

Mar 05 '24 09:03 elasticmachine

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

Mar 05 '24 10:03 elasticmachine

:green_heart: Build Succeeded

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Commit: 580998274d152230e540017345a2f3e5bfba3460