The documented upgrade process no longer works

[0x6675636b796f75676974687562]

Running

helm upgrade save-cloud oci://ghcr.io/saveourtool/save-cloud --version=$CHART_VERSION -f values-cce.yaml -f values-images.yaml

results in the following error:

Pulled: ghcr.io/saveourtool/save-cloud:0.2.1_1217
Digest: sha256:34a2730379069f24818e40fe9891c8de2a88256d261c6f6209163788fc8c94a7
ghcr.io/saveourtool/save-cloud:0.2.1_1217 contains an underscore.

OCI artifact references (e.g. tags) do not support the plus sign (+). To support
storing semantic versions, Helm adopts the convention of changing plus (+) to
an underscore (_) in chart version tags when pushing to a registry and back to
a plus (+) when pulling from a registry.
W1028 20:12:19.112156 1085276 warnings.go:70] policy/v1beta1 PodSecurityPolicy is deprecated in v1.21+, unavailable in v1.25+
W1028 20:12:19.415975 1085276 warnings.go:70] policy/v1beta1 PodSecurityPolicy is deprecated in v1.21+, unavailable in v1.25+
W1028 20:12:19.725287 1085276 warnings.go:70] policy/v1beta1 PodSecurityPolicy is deprecated in v1.21+, unavailable in v1.25+
Error: UPGRADE FAILED: cannot patch "backend-cosv" with kind Service: Service "backend-cosv" is invalid: metadata.resourceVersion: Invalid value: "": must be specified for an update

So either this is a new problem, or the documentation is incorrect.

[0x6675636b796f75676974687562]

Duplicate of #2965.