[packaging] Set mac to use x86 cpu

Bug: None
Change-Id: Ie7e3f81b72ca527311fdd4720f786dc16bd46ab2
Reviewed-on: https://flutter-review.googlesource.com/c/infra/+/29180
Reviewed-by: Godofredo Contreras <godofredoc@google.com>
Commit-Queue: Casey Hillers <chillers@google.com>
diff --git a/config/generated/flutter/luci/cr-buildbucket.cfg b/config/generated/flutter/luci/cr-buildbucket.cfg
index e41a961..ef690f4 100644
--- a/config/generated/flutter/luci/cr-buildbucket.cfg
+++ b/config/generated/flutter/luci/cr-buildbucket.cfg
@@ -48382,6 +48382,7 @@
     builders {
       name: "Mac Flutter Beta Packaging"
       swarming_host: "chromium-swarm.appspot.com"
+      dimensions: "cpu:x86"
       dimensions: "os:Mac-12"
       dimensions: "pool:luci.flutter.prod"
       exe {
@@ -48427,6 +48428,7 @@
     builders {
       name: "Mac Flutter Stable Packaging"
       swarming_host: "chromium-swarm.appspot.com"
+      dimensions: "cpu:x86"
       dimensions: "os:Mac-12"
       dimensions: "pool:luci.flutter.prod"
       exe {
diff --git a/config/generated/flutter/luci/project.cfg b/config/generated/flutter/luci/project.cfg
index 61da59d..1b70f14 100644
--- a/config/generated/flutter/luci/project.cfg
+++ b/config/generated/flutter/luci/project.cfg
@@ -7,7 +7,7 @@
 name: "flutter"
 access: "group:all"
 lucicfg {
-  version: "1.30.11"
+  version: "1.30.10"
   package_dir: "../../.."
   config_dir: "generated/flutter/luci"
   entry_point: "main.star"
diff --git a/config/packaging_config.star b/config/packaging_config.star
index 47be353..4303e9a 100644
--- a/config/packaging_config.star
+++ b/config/packaging_config.star
@@ -39,6 +39,7 @@
         },
         "mac": {
             "os": MAC_OS,
+            "dimensions": {"cpu": "x86"},
         },
         "mac_arm64": {
             "os": MAC_ARM64_OS,