Add empty skipped-profiling section

@chrisdone this is now necessary, correct?

build-constraints.yaml

@@ -898,6 +898,8 @@ skipped-benchmarks:
     # sometimes falls out-of-sync on hasql-postgres
     - hasql
 
+skipped-profiling: []
+
 # Mapping from Github account holding a package to the Github users who should
 # be pinged on failure. If no value is specified here, then the owning account
 # will be pinged.