Allow more concurrent windows executions

We still have 3 8 core windows machines

Change-Id: I634efbc662e2dec3fb59e44de4192d0238144d1d
diff --git a/infra/config/global/generated/luci-scheduler.cfg b/infra/config/global/generated/luci-scheduler.cfg
index 3b335c1..60c9a25 100644
--- a/infra/config/global/generated/luci-scheduler.cfg
+++ b/infra/config/global/generated/luci-scheduler.cfg
@@ -709,7 +709,7 @@
   acl_sets: "ci"
   triggering_policy {
     kind: GREEDY_BATCHING
-    max_concurrent_invocations: 1
+    max_concurrent_invocations: 2
   }
   buildbucket {
     server: "cr-buildbucket.appspot.com"
@@ -723,7 +723,7 @@
   acl_sets: "ci"
   triggering_policy {
     kind: GREEDY_BATCHING
-    max_concurrent_invocations: 1
+    max_concurrent_invocations: 2
     max_batch_size: 1
   }
   buildbucket {
diff --git a/infra/config/global/main.star b/infra/config/global/main.star
index 7e1fb37..e57d037 100755
--- a/infra/config/global/main.star
+++ b/infra/config/global/main.star
@@ -351,7 +351,8 @@
 
 
 r8_tester_with_default("windows", ["--all_tests"],
-    dimensions=get_dimensions(windows=True))
+    dimensions=get_dimensions(windows=True),
+    max_concurrent_invocations = 2)
 
 def internal():
   for name in ["linux-internal", "linux-internal_release"]: