ops: use defalut changelog-type for release-please (#86)

Author: jbottigliero

release-please-config.json

@@ -9,8 +9,7 @@
       "draft": false,
       "prerelease": false,
       "include-v-in-tag": false,
-      "include-component-in-tag": false,
-      "changelog-type": "github"
+      "include-component-in-tag": false
     }
   },
   "$schema": "https://raw.githubusercontent.com/googleapis/release-please/main/schemas/config.json"