opa: Update to 0.46.1

Changes:
0.46.1
------
This is bugfix release to resolve an issue in the release pipeline.
Everything else is the same as 0.46.0, which contains a mix of
bugfixes, optimizations, and new features:

* New language feature: refs in rule heads
* Entrypoint annotations in rule metadata
* New Built-in Functon: graphql.schema_is_valid
* New Built-in Functon: net.cidr_is_valid

0.45.0
------
This release contains a mix of bugfixes, optimizations, and new features:

* Improved Decision Logging with nd_builtin_cache
* New Built-in Function: regex.replace
* object.union_n Optimization

(leot)