add dependabot

Signed-off-by: strawberry <strawberry@puppygock.gay>

.github/dependabot.yml

+version: 2
+updates:
+  - package-ecosystem: github-actions
+    directory: "/"
+    schedule:
+      interval: daily
+    target-branch: main
+  - package-ecosystem: cargo
+    directory: "/"
+    schedule:
+      interval: "daily"
+    target-branch: main
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