[codeowners] Add IAM component to WebApp codeowners

Author: easyCZ

.github/CODEOWNERS

@@ -49,6 +49,7 @@
 /install/installer/pkg/components/proxy @gitpod-io/engineering-webapp
 /install/installer/pkg/components/registry-facade @gitpod-io/engineering-workspace
 /install/installer/pkg/components/public-api-server @gitpod-io/engineering-webapp
+/install/installer/pkg/components/iam @gitpod-io/engineering-webapp
 /install/installer/pkg/components/server @gitpod-io/engineering-webapp
 /install/installer/pkg/components/server/ide @gitpod-io/engineering-ide
 /install/installer/pkg/components/usage @gitpod-io/engineering-webapp