Remove the replace for ocm.software/ocm when new ocm version is released

[nesmabadr]

Description

We do a replace for the ocm.software to use v0.15.0 instead of 0.16.0 due to the bug mentioned here concerning pushing to an insecure registry.

ACs

• [ ] Bump the ocm package to the new version
• [ ] Remove the replace (here)
• [ ] Remove the allow gomoddirectives for the ocm (here)