bump x.y.z version to odd y following creation of RELEASE_3_23 branch

Author: jwokaty

DESCRIPTION

@@ -1,7 +1,7 @@
 Package: miloR
 Type: Package
 Title: Differential neighbourhood abundance testing on a graph
-Version: 2.8.0
+Version: 2.9.0
 Authors@R:
     c(person("Mike", "Morgan", role=c("aut", "cre"), email="michael.morgan@abdn.ac.uk",
      comment=c(ORCID="0000-0003-0757-0711")),