Fix typo in maven-publish.yml

Author: willhains

.github/workflows/maven-publish.yml

@@ -17,7 +17,7 @@ jobs:
 
     steps:
     - name: Checkout Code
-    - uses: actions/checkout@v2
+      uses: actions/checkout@v2
 
     - name: Set up Apache Maven Central
       uses: actions/setup-java@v2