github-actions: enable for all the active branches

[v1v]

What does this PR do?

Support all the active branches when running the gH action for bumping versions using updatecli

Why is it important?

Because the backports have been merged:

• [CI] Stable stack version override #8352 (comment)

Checklist

• I have read and understood the pull request guidelines of this project.
• 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/fragments using the changelog tool
• I have added an integration test or an E2E test

Disruptive User Impact

How to test this PR locally

Related issues

Questions to ask yourself

• How are we going to support this in production?
• How are we going to measure its adoption?
• How are we going to debug this?
• What are the metrics I should take care of?
• ...

[v1v]

We cannot use automerge here, the branch protections have a higher precedence and the GitHub Actions [bot] does not support it yet, see https://github.com/orgs/community/discussions/13836.

Pull Request available at:

	https://github.com/elastic/elastic-agent/pull/8576

ERROR: action stage:	"Merge method merge commits are not allowed on this repository and Pull request User is not authorized for this protected branch"
Existing GitHub pull request found: https://github.com/elastic/elastic-agent/pull/8576
ERROR: running actions:
errors occurred while running actions:
	* Merge method merge commits are not allowed on this repository and Pull request User is not authorized for this protected branch

=============================

[pazone]

First we need to merge these backports: #8540