Add dependabot config to automatically bump dependencies in CI (#22)

* Add dependabot config to automatically bump dependencies in CI

* Include main requirements.txt in depdendabot config

.github/dependabot.yml

@@ -0,0 +1,23 @@
+version: 2
+updates:
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "daily"
+
+  - package-ecosystem: "pip"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    ignore:
+      # setuptools releases new versions almost daily
+      - dependency-name: "setuptools"
+        update-types: ["version-update:semver-patch"]
+
+  - package-ecosystem: "pip"
+    directory: "/.github/workflows/requirements"
+    schedule:
+      interval: "weekly"
+    ignore:
+      - dependency-name: "setuptools"
+        update-types: ["version-update:semver-patch"]