bump resource classes

Author: chrisbreiding

circle.yml

@@ -1114,13 +1114,15 @@ jobs:
 
   runner-integration-tests-firefox:
     <<: *defaults
+    resource_class: medium
     parallelism: 2
     steps:
       - run-runner-integration-tests:
           browser: firefox
 
   runner-integration-tests-electron:
     <<: *defaults
+    resource_class: medium
     parallelism: 2
     steps:
       - run-runner-integration-tests:
@@ -1145,6 +1147,7 @@ jobs:
 
   driver-integration-tests-chrome-beta:
     <<: *defaults
+    resource_class: medium
     parallelism: 5
     steps:
       - run-driver-integration-tests: