Enable dependabot. (#7486)

Author: ericstj

.github/dependabot.yml

@@ -0,0 +1,10 @@
+# Configure regular dependency updates
+# Please see the documentation for all configuration options:
+# https://docs.github.com/code-security/dependabot/dependabot-version-updates/configuration-options-for-the-dependabot.yml-file
+
+version: 2
+updates:
+  - package-ecosystem: "nuget"
+    directory: "/" # Location of package manifests
+    schedule:
+      interval: "weekly"