fix:update-python-version-for-helm-ci

[GVengelen]

What this PR does / why we need it:

Which issue(s) this PR fixes:
Fixes #

Special notes for your reviewer:
This issue resolves failing ci, python 3.7 is depricated and not supported in ubuntu 24.04. See thread here

Checklist

• [ x] Reviewed the CONTRIBUTING.md guide (required)
• [ x] Documentation added
• [ x] Tests updated
• [x ] Title matches the required conventional commits format, see here
  • Note that Promtail is considered to be feature complete, and future development for logs collection will be in Grafana Alloy. As such, feat PRs are unlikely to be accepted unless a case can be made for the feature actually being a bug fix to existing behavior.
• [x ] Changes that require user attention or interaction to upgrade are documented in docs/sources/setup/upgrade/_index.md
• [ x] If the change is deprecating or removing a configuration option, update the deprecated-config.yaml and deleted-config.yaml files respectively in the tools/deprecated-config-checker directory. Example PR

[CLAassistant]

All committers have signed the CLA.