Add VERSION to raft-ann-bench package

rapidsai#2285 added dynamic versioning
to pyproject.toml for raft-ann-bench, but did not properly copy in
the VERSION file. Copy it in with tool.setuptools.package-data.

python/raft-ann-bench/pyproject.toml

@@ -35,7 +35,7 @@ Homepage = "https://github.com/rapidsai/raft"
 where = ["src"]
 
 [tool.setuptools.package-data]
-"*" = ["*.*"]
+"*" = ["*.*", "VERSION"]
 
 [tool.isort]
 line_length = 79