build: do not tag this in the named open edx release (#239)

This repo has been "maybe" for a while, but it has not been tagged yet. This
commit removes the "maybe", we simply will not tag it, since it isn't clear
from the README or the ADRs how this microservice could be used by an Open edX
site operator.

According to OEP-10:
> To be included in an Open edX release, a component must meet these criteria.
> * ...
> * It must be installable in at least one of the supported installation methods.
> * It must be usable in the installed configuration.

This decision can always be reversed in the future by adding a release branch
to catalog-info.yaml

openedx.yaml

@@ -13,9 +13,3 @@ oeps:
     oep-18: true
     oep-30:
         state: true
-openedx-release:
-    # The openedx-release key is described in OEP-10:
-    #   https://open-edx-proposals.readthedocs.io/en/latest/oep-0010-proc-openedx-releases.html
-    # The FAQ might also be helpful: https://openedx.atlassian.net/wiki/spaces/COMM/pages/1331268879/Open+edX+Release+FAQ
-    maybe: true   # Delete this "maybe" line when you have decided about Open edX inclusion.
-    ref: main