Migrate to renovate for dependency updates (#14246)

.github/dependabot.yml

@@ -1,18 +0,0 @@
-version: 2
-updates:
-  - package-ecosystem: "github-actions"
-    directory: "/"
-    schedule:
-      interval: "daily"
-  - package-ecosystem: "pip"
-    directory: "/"
-    schedule:
-      interval: "daily"
-  - package-ecosystem: "uv"
-    directory: "/"
-    schedule:
-      interval: "daily"
-    groups:
-      all-dependencies:
-        patterns:
-          - "*"

.github/renovate.json5

@@ -0,0 +1,11 @@
+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "enabledManagers": ["github-actions", "pep621"],
+  "dependencyDashboard": true,
+  "semanticCommits": "enabled",
+  "schedule": ["every day"],
+  "lockFileMaintenance": {
+    "enabled": true,
+    "schedule": ["every month"]
+  }
+}