chore: Add default value of '' for the inputted deps list

Author: lqiu96

.github/workflows/dependency_compatibility_test.yaml

@@ -9,6 +9,7 @@ on:
       dependencies-list:
         description: 'Comma-separated list of dependencies to test (Format: dep1=1.0,dep2=2.0)'
         required: false
+        default: ''
   schedule:
     - cron: '0 1 * * *' # Nightly at 1am