Up per-product memory usage to 30 GB

Reduce multiproduct_kati parallelism by upping required memory per product
to 30 GB.

Bug: 201671935
Test: builds
Change-Id: Ia756f309459d28e22a49f190a5227a139b356a1f
diff --git a/cmd/multiproduct_kati/main.go b/cmd/multiproduct_kati/main.go
index 3c9cac1..07b1e3f 100644
--- a/cmd/multiproduct_kati/main.go
+++ b/cmd/multiproduct_kati/main.go
@@ -301,7 +301,7 @@
 		jobs = runtime.NumCPU() / 4
 
 		ramGb := int(detectTotalRAM() / (1024 * 1024 * 1024))
-		if ramJobs := ramGb / 25; ramGb > 0 && jobs > ramJobs {
+		if ramJobs := ramGb / 30; ramGb > 0 && jobs > ramJobs {
 			jobs = ramJobs
 		}