Roll RTS model from tQPfmxV4X... to b4o6CQ43w...

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/rts-mac-amd64-chromium-autoroll
Please CC guterman@google.com on the revert to ensure that a human
is aware of the problem.

To file a bug in Chromium: https://bugs.chromium.org/p/chromium/issues/entry

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md

Tbr: guterman@google.com
Change-Id: Iaa050146a1a7ef3365be8ab6a7648380b43be903
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3815153
Commit-Queue: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Bot-Commit: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/main@{#1032374}

DEPS

@@ -873,7 +873,7 @@ deps = {
       'packages': [
         {
           'package': 'chromium/rts/model/mac-amd64',
-          'version': 'tQPfmxV4X7fhfVXGB2E625s_XnW9tcIeFzHJGdG8AGEC',
+          'version': 'b4o6CQ43wSB0wLS10qO2wit1ldcDktPcQLDMjE5BQGUC',
         },
       ],
       'dep_type': 'cipd',