chore: bump helm-chart version to 1.0.5

We've had two patches to the helm-chart since the last time we bumped the Chart
version.

- https://github.com/cdr/code-server/commit/1ffca5751c36235af686d13c788c8ace5bb0a117
- https://github.com/cdr/code-server/commit/5a36627aae7d8772f4190453dc8aae5da7e73104

This version bump ensures that chart version has the correct date.