fix: use proper module name for go module (#214)

Addressing [build failure](https://github.com/cdklabs/cdk-monitoring-constructs/runs/7810695971?check_suite_focus=true).

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_By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license_

Author: Eugene Cheung

.projenrc.js

@@ -38,7 +38,7 @@ const project = new awscdk.AwsCdkConstructLibrary({
   },
   // Artifact config: Go
   publishToGo: {
-    moduleName: "github.com/cdklabs/cdkmonitoringconstructs",
+    moduleName: "github.com/cdklabs/cdk-monitoring-constructs",
   },
 
   // Auto approval config