chore: replace Dependabot with Renovate (#1486)

.github/dependabot.yml

@@ -1,24 +0,0 @@
-# Set update schedule for GitHub Actions
-
-version: 2
-updates:
-  - package-ecosystem: "github-actions"
-    directory: "/"
-    schedule:
-      interval: "weekly"
-
-  - package-ecosystem: cargo
-    directory: "/"
-    schedule:
-      interval: "weekly"
-      day: "monday"
-      time: "06:00"
-      timezone: "UTC"
-    versioning-strategy: increase
-    labels: ["dependencies", "cargo"]
-    commit-message:
-      prefix: "deps(cargo)"
-      include: "scope"
-    groups:
-      cargo-minor-patch:
-        update-types: ["minor", "patch"]