statprof: remove superfluous sys.version_info check

Always true since we require Python 3 now.

Differential Revision: https://phab.mercurial-scm.org/D12345

mercurial/statprof.py

@@ -607,9 +607,7 b' def display_by_method(data, fp):'
             # only show line numbers for significant locations (>1% time spent)
             if stat.selfpercent() > 1:
                 source = stat.site.getsource(25)
-                if sys.version_info.major >= 3 and not isinstance(
-                    source, bytes
-                ):
+                if not isinstance(source, bytes):
                     source = pycompat.bytestr(source)
 
                 stattuple = (