Update to perf profile

Updated performance metrics for ds.colnames.

Author: StuartWheater

tests/testthat/perf_files/default_perf_profile.csv

@@ -6,9 +6,9 @@
 "ds.asNumeric::perf:0","2.185","0.5","2"
 "ds.assign::perf::0","5.490","0.5","2"
 "ds.class::perf::combine:0","4.760","0.5","2"
-"ds.colnames::perf:0","4.159","0.5","2"
+"ds.colnames::perf:0","9.079","0.5","2"
 "ds.exists::perf::combine:0","11.09","0.5","2"
 "ds.length::perf::combine:0","9.479","0.5","2"
 "ds.mean::perf::combine:0","9.650","0.5","2"
 "ds.mean::perf::split:0","11.26","0.5","2"
-"void::perf::void::0","46250.0","0.5","2"
+"void::perf::void::0","46250.0","0.5","2"