tests: finish removing pyqver from the repository (#14294)

Remove a few remaining mentions of the pyqver package, which was removed in #14289.

lib/spack/external/_pytest/pytester.py

@@ -569,7 +569,7 @@ def syspathinsert(self, path=None):
     def _possibly_invalidate_import_caches(self):
         # invalidate caches if we can (py33 and above)
         try:
-            import importlib  # nopyqver
+            import importlib
         except ImportError:
             pass
         else:

lib/spack/external/ruamel/yaml/compat.py

@@ -12,7 +12,7 @@
     from ruamel.ordereddict import ordereddict
 except:
     try:
-        from collections import OrderedDict  # nopyqver
+        from collections import OrderedDict
     except ImportError:
         from ordereddict import OrderedDict
     # to get the right name import ... as ordereddict doesn't do that