test: give slow tests more time on Rasberry PIs

Refs: nodejs#42379

A number of tests have been failing internmittently
on the Rasberry PIs with timeouts since the update
to OpenSSL 3.0. Give them more time.

Signed-off-by: Michael Dawson <mdawson@devrus.com>

PR-URL: nodejs#42380
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>

tools/test.py

@@ -896,7 +896,7 @@ def GetTestStatus(self, context, sections, defs):
 
 
 TIMEOUT_SCALEFACTOR = {
-    'arm'   : { 'debug' :  8, 'release' : 2 }, # The ARM buildbots are slow.
+    'arm'   : { 'debug' :  8, 'release' : 3 }, # The ARM buildbots are slow.
     'ia32'  : { 'debug' :  4, 'release' : 1 },
     'ppc'   : { 'debug' :  4, 'release' : 1 },
     's390'  : { 'debug' :  4, 'release' : 1 } }