[docker] remove warning on LABEL

```
LegacyKeyValueFormat: "LABEL key=value" should be used instead of legacy "LABEL key value" format (line 2)
```

Dockerfile

@@ -1,5 +1,5 @@
 FROM python:3-bookworm
-LABEL org.opencontainers.image.authors Victor Seva <[email protected]>
+LABEL org.opencontainers.image.authors="Victor Seva <[email protected]>"
 
 WORKDIR /project
 VOLUME /etc/kamcli