Work CI-CD

- Move github actions yaml to correct location.

***NO_CI***

Author: josesimoes

.github/pr-checks.yml renamed to .github/workflows/pr-checks.yml

@@ -8,8 +8,8 @@ name: Update .NET nanoFramework dependencies
 
 on:
   schedule:
-  # At 00:00 UTC every day.
-  - cron:  '00 00 * * *'
+  # At 00:10 UTC every Mon,Thu.
+  - cron:  '10 00 * * Mon,Thu'
   repository_dispatch:
     types: update-dependencies