test,tools: increase pummel/benchmark test timeout from 4x to 6x

The win10-COMPILED_BY-vs2019 hosts in CI are very slow and timing out on
certain tests in pummel and (previously) benchmark. Increase timeout
from 4x to 6x.

PR-URL: #40684
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Voltrex <mohammadkeyvanzade94@gmail.com>

tools/test.py

@@ -945,7 +945,7 @@ def GetVm(self, arch, mode):
   def GetTimeout(self, mode, section=''):
     timeout = self.timeout * TIMEOUT_SCALEFACTOR[ARCH_GUESS or 'ia32'][mode]
     if section == 'pummel' or section == 'benchmark':
-      timeout = timeout * 4
+      timeout = timeout * 6
     return timeout
 
 def RunTestCases(cases_to_run, progress, tasks, flaky_tests_mode):