Release v5.15.12

[github-actions]

Release v5.15.12

Changes

• Only call wcs_get_subscriptions_for_order() if order ID is > 0 #772

[ajaynes-godaddy]

@agibson-godaddy I merged #772 not realizing it was previously based on the release/5.15.11 branch and had since updated to master. So those changes from #772 have already been merged to master. 🤦

I went ahead and added a changelog entry for this release covering the already-merged changes, as well as changelog entries and dates going back to 5.15.8. See 5386cb4 and 386925d.

[agibson-godaddy]

@agibson-godaddy I merged #772 not realizing it was previously based on the release/5.15.11 branch and had since updated to master. So those changes from #772 have already been merged to master. 🤦

I went ahead and added a changelog entry for this release covering the already-merged changes, as well as changelog entries and dates going back to 5.15.8. See 5386cb4 and 386925d.

Sorry @ajaynes-godaddy I forgot I had started the PR against a different version. Thanks for handling the changelog as well -- I'd forgotten that existed!