ci: fix updatecli regex captured group

[rogercoll]

What does this PR do?

Fixes the caputred group of the updatecli regex

Why is it important?

Fixes the execution, see sample action output:

condition: condition#is-new-version
------------------------
The shell 🐚 command "/bin/sh /tmp/updatecli/bin/b997ea153e9bfe0589efdab5d77ff5403bb61967c423e2b536950c893b408151.sh" exited on error (exit code 2) with the following output:
----
----

command stderr output was:
----
/tmp/updatecli/bin/b997ea153e9bfe0589efdab5d77ff5403bb61967c423e2b536950c893b408151.sh: 1: [: 0.11.1: unexpected operator

----
shell command failed. Expected exit code 0 but got 2
✗ shell condition of type "console/output" not passing

Example execution: #11541

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?
• ...

[rogercoll]

@v1v @swiatekm Apologies for the missed review, just applied suggestions from #11542 (comment)

[elasticmachine]

Pinging @elastic/elastic-agent-control-plane (Team:Elastic-Agent-Control-Plane)