Prevent failure when resolving version tags in oras memory store

- The newReference() function transforms version tags by replacing + with _ for OCI compatibility
- But the code was using the original ref (with +) for TagBytes()
- Then it tries to find the tagged reference using parsedRef.String() (with _)
- This mismatch causes the Resolve method to fail with "not found"
- By using parsedRef.String() consistently in both places, the references will match and the lookup will succeed.

Close: https://github.com/helm/helm/issues/30881
Signed-off-by: Benoit Tigeot <benoit.tigeot@lifen.fr>

pkg/registry/client.go

@@ -693,7 +693,7 @@ func (c *Client) Push(data []byte, ref string, options ...PushOption) (*PushResu
 		return nil, err
 	}
 
-	manifestDescriptor, err := oras.TagBytes(ctx, memoryStore, ocispec.MediaTypeImageManifest, manifestData, ref)
+	manifestDescriptor, err := oras.TagBytes(ctx, memoryStore, ocispec.MediaTypeImageManifest, manifestData, parsedRef.String())
 	if err != nil {
 		return nil, err
 	}