Update README.md

Up version in example

Author: stCarolas

README.md

@@ -4,7 +4,7 @@ Add this step into workflow
 
 ```
     - name: Set up Maven
-      uses: stCarolas/setup-maven@v4.4
+      uses: stCarolas/setup-maven@v4.5
       with:
         maven-version: 3.8.2
 ```