Merge pull request riscv-non-isa#82 from rivos-inc/dev/kbroch/dependa…

…bot-update-docs-resources-submodule

add dependabot to create PR to update the submodules to latest

.github/dependabot.yml

@@ -0,0 +1,8 @@
+---
+# https://docs.github.com/en/code-security/dependabot/dependabot-version-updates/configuration-options-for-the-dependabot.yml-file#package-ecosystem
+version: 2
+updates:
+  - package-ecosystem: gitsubmodule
+    directory: /
+    schedule:
+      interval: daily