Add dependabot workflow

.github/dependabot.yml

@@ -0,0 +1,23 @@
+# To get started with Dependabot version updates, you'll need to specify which
+# package ecosystems to update and where the package manifests are located.
+
+version: 2
+updates:
+- package-ecosystem: "pip" # See documentation for possible values
+  directory: "/" # Location of package manifests
+  reviewers:
+    - "wenzhe-log10"
+    - "kxtran"
+  schedule:
+    interval: "daily"
+    time: "06:00"
+    timezone: "America/Los Angeles"
+  allow:
+    - dependency-name: "openai"
+      dependency-type: "all"
+
+    - dependency-name: "anthropic"
+      dependency-type: "all"
+
+    - dependency-name: "magentic"
+      dependency-type: "all"