[roll] Roll fuchsia [roll] Roll third_party/mesa pvr: amend num temps calculation when wg_size is not provided

Original-Fixes: 7a32dc673ba ("pvr: add device info and functions for calculating ava...")
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/37724>
(cherry picked from commit e7c409cd29b1c4e58627b04cd725932d1a181d41)
Original-Revision: 7c7f187ff7eb0135ff3584dcfe40a4de3f10cf94

Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1407894
Original-Revision: aacfe738bbfc939a7ee15472deaff16975ac7db5
GitOrigin-RevId: f29c85bfd7038114830b8f92f98dfdc2385a8f4c
Change-Id: Ic4d93bc4cf9b4d6708b6a2a2e62b49ebac89ac5f
diff --git a/stem b/stem
index a31ae2d..fd85dc4 100644
--- a/stem
+++ b/stem
@@ -7,7 +7,7 @@
             manifest="manifests/platform"
             root=""
             remote="https://fuchsia.googlesource.com/fuchsia"
-            revision="e0eb5fcc45453a4c039d9db903fc011a5b9ae37b"/>
+            revision="aacfe738bbfc939a7ee15472deaff16975ac7db5"/>
   </imports>
   <projects>
     <project name="cobalt"