fix: remove the workflow of scala-steward

Author: j5ik2o

.github/workflows/scala-steward.yml

@@ -0,0 +1,16 @@
+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "extends": ["config:recommended"],
+  "commitMessagePrefix": "chore(deps):",
+  "platformAutomerge": true,
+  "packageRules": [
+    {
+      "matchUpdateTypes": ["minor", "patch", "pin", "digest"],
+      "automerge": true
+    },
+    {
+      "matchDepTypes": ["devDependencies"],
+      "automerge": true
+    }
+  ]
+}