update CODEOWNERS (#1004)

self descriptive

Author: duncanista

.github/CODEOWNERS

@@ -1,2 +1,4 @@
+* @DataDog/serverless-aws
+
 .github/chainguard/serverless-init-ci-publish.sts.yaml @DataDog/serverless
-.github/publish-serverless-init-to-ghcr.yaml @DataDog/serverless
+.github/publish-serverless-init-to-ghcr.yaml @DataDog/serverless