chore: bump nri-flex to 1.12.0 (#1855)

Author: rubenruizdegauna

build/embed/integrations.version

@@ -1,5 +1,5 @@
 #ohi-repo-name,version
 nri-docker,v2.0.2
-nri-flex,v1.11.0
+nri-flex,v1.12.0
 nri-winservices,v1.0.1
 nri-prometheus,v2.21.1