Remove entry-points from raft-ann-bench

Building raft-ann-bench can throw a

```
  distutils.errors.DistutilsOptionError: No configuration found for dynamic 'entry-points'.
  Some dynamic fields need to be specified via `tool.setuptools.dynamic`
  others must be specified via the equivalent attribute in `setup.py`.
```

error sometimes depending on distutils reversion.

This is becase we were specifying dynamic entry-points, but not including
the relevant `tool.setuptools.dynamic` section in pyproject.toml. Remove this
to allow building

python/raft-ann-bench/pyproject.toml

@@ -27,7 +27,6 @@ classifiers = [
     "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
 ]
-dynamic = ["entry-points"]
 
 [project.urls]
 Homepage = "https://github.com/rapidsai/raft"