Set the chart's placeholder version to 0.42.0

Cosmetic: make helm-package passes --version and --app-version from the
tag, so these two fields decide nothing about what gets published. Still
done, as with b848143 (0.41.3) and 7665e5e (0.41.2) before it, because a
tree heading for v0.42.0 that still says 0.41.3 tells its reader
something false.

charts/terdut-server/Chart.yaml

@@ -15,5 +15,5 @@ type: application
 # appVersion and image.tag in values.yaml no longer agree, and that is not an oversight:
 # image.tag stays "latest", which is what a local install actually pulls. appVersion is
 # metadata and drives nothing.
-version: 0.41.3
-appVersion: "v0.41.3"
+version: 0.42.0
+appVersion: "v0.42.0"