bump cpu requests for agent-sandbox presubmits

These jobs are running a little slow, bumping the cpu requests to
improve the speed.

Author: sdowell

config/jobs/kubernetes-sigs/agent-sandbox/agent-sandbox-presubmits-main.yaml

@@ -34,10 +34,10 @@ presubmits:
         - dev/ci/presubmits/test-unit
         resources:
           requests:
-            cpu: 1
+            cpu: 2
             memory: 4Gi
           limits:
-            cpu: 1
+            cpu: 2
             memory: 4Gi
     annotations:
       testgrid-dashboards: sig-apps-agent-sandbox
@@ -53,10 +53,10 @@ presubmits:
         - dev/ci/presubmits/lint-go
         resources:
           requests:
-            cpu: 1
+            cpu: 2
             memory: 4Gi
           limits:
-            cpu: 1
+            cpu: 2
             memory: 4Gi
     annotations:
       testgrid-dashboards: sig-apps-agent-sandbox