bump to v0.9.0-rc

ATTRIBUTIONS.md

@@ -44,7 +44,7 @@ BSD license.
 
 https://github.com/halfflat/tinyopt
 
-##  Random123
+## Random123
 A header only counter-based random number generator, written by DE Shaw research
 BSD license.
 

VERSION

-0.8.2-dev
+0.9.0-rc

pyproject.toml

 [project]
 name = "arbor"
-version = "0.8.2-dev" # TODO: make dependent on VERSION file. Blocked by https://github.com/scikit-build/scikit-build-core/issues/230
+version = "0.9.0-rc" # TODO: make dependent on VERSION file. Blocked by https://github.com/scikit-build/scikit-build-core/issues/230
 readme = {file = "README.md", content-type = "text/markdown"}
 license = {file = "LICENSE"}
 description = "High performance simulation of networks of multicompartment neurons."