Bump version for v1.18.0-rc.2 release

Signed-off-by: Carlos Eduardo Arango Gutierrez <eduardoa@nvidia.com>

Author: ArangoGutierrez

versions.mk

@@ -14,7 +14,7 @@
 
 LIB_NAME := nvidia-container-toolkit
 LIB_VERSION := 1.18.0
-LIB_TAG := rc.1
+LIB_TAG := rc.2
 
 # The package version is the combination of the library version and tag.
 # If the tag is specified the two components are joined with a tilde (~).