chore: update Dex to 2.44.0

[Khayet]

Overview

Updating dex to 2.44.0:
https://github.com/dexidp/dex/releases/tag/v2.44.0

What this PR does / why we need it

There's a new dex version which we should make available via the helm chart.

Special notes for your reviewer

Checklist

• Change log updated in Chart.yaml (see the contributing guide for details)
• Chart version bumped in Chart.yaml (see the contributing guide for details)
• Documentation regenerated by running make docs

[Khayet]

I tested locally that the image is available under ghcr.io/dexidp/dex:v2.44.0 and that the new version installs in a local k8s cluster. Not sure if this is covered by the pipelines.