Bump CloudWatch Synthetics runtime version (#10)

* chore: bump cloudwatch synthetics runtime version

* chore: fix linting issue

Author: chn217

source/lib/stacks/druidStack.ts

@@ -139,7 +139,10 @@ export abstract class DruidStack extends cdk.Stack {
 
     protected createCanary(druidEndpoint: string): synthetics.Canary {
         return new synthetics.Canary(this, 'canary', {
-            runtime: synthetics.Runtime.SYNTHETICS_NODEJS_PUPPETEER_5_1,
+            runtime: new synthetics.Runtime(
+                'syn-nodejs-puppeteer-5.2',
+                synthetics.RuntimeFamily.NODEJS
+            ),
             vpc: this.baseInfra.vpc,
             vpcSubnets: { subnets: this.baseInfra.vpc.privateSubnets },
             environmentVariables: { DRUID_ENDPOINT: druidEndpoint },