ci: replace dependabot with renovate

Signed-off-by: Kengo TODA <skypencil@gmail.com>

.github/auto-merge.yml

@@ -1,6 +0,0 @@
-minApprovals:
-  NONE: 0
-requiredLabels:
-  - dependencies
-updateBranch: true
-mergeMethod: rebase

.github/dependabot.yml

@@ -1,10 +0,0 @@
-version: 2
-updates:
-  - package-ecosystem: npm
-    directory: "/"
-    schedule:
-      interval: daily
-    commit-message:
-      prefix: fix
-      prefix-development: chore
-      include: scope

renovate.json

@@ -0,0 +1,14 @@
+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "packageRules": [
+    {
+      "matchDepTypes": ["devDependencies"],
+      "matchUpdateTypes": ["minor", "patch"],
+      "matchCurrentVersion": "!/^0/",
+      "automerge": true
+    }
+  ],
+  "extends": [
+    "config:base"
+  ]
+}