deps(github-actions): bump updatecli version

[v1v]

What is the problem this PR solves?

Bump versions for the updatecli and enable dependabot.

Let's try to fix the existing issue with #4353 (comment) and

How to test this PR locally

No locally but in the CI, see https://github.com/elastic/fleet-server/actions/runs/12965426929 and https://github.com/elastic/fleet-server/actions/runs/12965447758

I can see https://github.com/elastic/fleet-server/pull/4323/commits hence it's much better now, or at least, I can see it didn't close it with a force push.

Design Checklist

• I have ensured my design is stateless and will work when multiple fleet-server instances are behind a load balancer.
• I have or intend to scale test my changes, ensuring it will work reliably with 100K+ agents connected.
• I have included fail safe mechanisms to limit the load on fleet-server: rate limiting, circuit breakers, caching, load shedding, etc.

Checklist

• 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

Related issues

[mergify]

This pull request does not have a backport label. Could you fix it @v1v? 🙏
To fixup this pull request, you need to add the backport labels for the needed
branches, such as:

• backport-./d./d is the label to automatically backport to the 8./d branch. /d is the digit

[mergify]

backport-8.x has been added to help with the transition to the new branch 8.x.
If you don't need it please use backport-skip label and remove the backport-8.x label.