Bump helm chart version (#674)

Quite a few chart features have landed since the last version:
https://github.com/poolsideai/vllm-production-stack/commits/main/helm?since=2025-07-30&until=2025-09-03

I'm particularly interested in autoscaling from #568.

Signed-off-by: Philip Potter <[email protected]>

Author: philandstuff

helm/Chart.yaml

@@ -15,7 +15,7 @@ type: application
 # This is the chart version. This version number should be incremented each time you make changes
 # to the chart and its templates, including the app version.
 # Versions are expected to follow Semantic Versioning (https://semver.org/)
-version: 0.1.6
+version: 0.1.7
 
 maintainers:
   - name: apostac