Bump version for v1.19.0-rc.1 release

Signed-off-by: Evan Lezar <[email protected]>

Author: elezar

versions.mk

@@ -14,7 +14,7 @@
 
 LIB_NAME := nvidia-container-toolkit
 LIB_VERSION := 1.19.0
-LIB_TAG := dev
+LIB_TAG := rc.1
 
 # 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 (~).