chore: Bump version to 2.3.0.rc2 (#12920)

Signed-off-by: Charlie Truong <chtruong@nvidia.com>

Author: chtruong814

nemo/package_info.py

@@ -16,7 +16,7 @@
 MAJOR = 2
 MINOR = 3
 PATCH = 0
-PRE_RELEASE = 'rc0'
+PRE_RELEASE = 'rc2'
 
 # Use the following formatting: (major, minor, patch, pre-release)
 VERSION = (MAJOR, MINOR, PATCH, PRE_RELEASE)