chore: remove dependabot

.github/dependabot.yml

@@ -1,10 +0,0 @@
-version: 2
-updates:
-  - package-ecosystem: "npm" # 你项目的包管理器类型，例如 "npm", "pip", "maven", "gradle", "docker"或者其他
-    directory: "/" # 包管理器文件在仓库的位置，"/"代表仓库的根目录
-    schedule:
-      interval: "weekly" # Dependabot检查更新的频率，可以是"daily", "weekly", 或者 "monthly"
-    open-pull-requests-limit: 3 # Dependabot同时打开的pull request的最大数量
-    ignore:
-      - dependency-name: "axios"
-      - dependency-name: "dotenv"