playground: 4x resources for the tip playground

Experiment whether increasing instance shape can help mitigate build
timeouts.

For golang/go#56977

Change-Id: Ib516b97b9729151542331f8bae8ad5725914d2f2
Reviewed-on: https://go-review.googlesource.com/c/playground/+/461795
Run-TryBot: Robert Findley <rfindley@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Heschi Kreinick <heschi@google.com>

app.gotip.yaml

diff --git a/app.gotip.yaml b/app.gotip.yaml
index b4f6463..9f8b227 100644
--- a/app.gotip.yaml
+++ b/app.gotip.yaml
@@ -6,8 +6,8 @@
   name: projects/golang-org/global/networks/golang
 
 resources:
-  cpu: 2
-  memory_gb: 2
+  cpu: 8
+  memory_gb: 8
 
 automatic_scaling:
   min_num_instances: 5