updated actions/checkout@v2 to actions/checkout@v3

Attempting to fix this error: The following actions uses node12 which is deprecated and will be forced to run on node16: actions/checkout@v2, actions/setup-java@v1. For more info: https://github.blog/changelog/2023-06-13-github-actions-all-actions-will-run-on-node16-instead-of-node12-by-default/

Author: abhishekomp

.github/workflows/repo_dispatch_maven.yml

@@ -18,7 +18,7 @@ jobs:
     steps:
       # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
       - name: Step 1 - Checkout master branch from Github
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
 
       - name: Set up Java
         uses: actions/setup-java@v1