chore: add dependabot

Author: fischeti

.github/dependabot.yml

@@ -0,0 +1,27 @@
+# Copyright 2024 ETH Zurich and University of Bologna.
+# Solderpad Hardware License, Version 0.51, see LICENSE for details.
+# SPDX-License-Identifier: SHL-0.51
+
+version: 2
+updates:
+  # Python dependencies managed by uv (pyproject.toml + uv.lock)
+  - package-ecosystem: "uv"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    cooldown:
+      default-days: 7
+    groups:
+      python-deps:
+        patterns: ["*"]
+
+  # GitHub Actions used in .github/workflows
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    cooldown:
+      default-days: 7
+    groups:
+      github-actions:
+        patterns: ["*"]