feat: add dependabot (#52)

Author: gadomski

.github/dependabot.yml

@@ -0,0 +1,21 @@
+version: 2
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+  - package-ecosystem: "cargo"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+  - package-ecosystem: "pip"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+  - package-ecosystem: "cargo"
+    directory: "/python"
+    schedule:
+      interval: "weekly"
+  - package-ecosystem: "cargo"
+    directory: "/cli"
+    schedule:
+      interval: "weekly"