remove outdated vinca options

Author: Tobias-Fischer

vinca.yaml

@@ -8,11 +8,6 @@ conda_index:
 # Reminder for next full rebuild, the next build number should be 14
 build_number: 13
 
-# Specify that exactly the build_number used vinca*.yaml or pkg_additional_info.yaml
-# should be used, not some build number obtained by checking the maximum
-# of all build numbers used in the target channel
-use_explicit_build_number: true
-
 mutex_package:
   name: "ros2-distro-mutex"
   version: "0.7.0"