uptime-kuma: update appVersion to 1.17.0 (chart version 1.3.4)

[johanneskastl]

Description of the change

update-kuma appVersion increased to 1.17.0

Benefits

new version, bugfixes

Possible drawbacks

new version might contain new bugs...

Applicable issues

none

Checklist

• [X ] Title of the PR starts with chart name (e.g. [home-assistant])
• [X] Chart version bumped in Chart.yaml according to semver.
• [X] Chart artifacthub.io/changes changelog annotation has been updated in Chart.yaml. See Artifact Hub documentation for more info.
• [X] Variables have been documented in the values.yaml file. No new values