[Release 2.12] advance candidate version

Author: atalman

tools/scripts/generate_binary_build_matrix.py

@@ -85,7 +85,7 @@
 
 
 CURRENT_NIGHTLY_VERSION = "2.12.0"
-CURRENT_CANDIDATE_VERSION = "2.11.0"
+CURRENT_CANDIDATE_VERSION = "2.12.0"
 CURRENT_STABLE_VERSION = "2.11.0"
 CURRENT_VERSION = CURRENT_STABLE_VERSION