Uses single quotes

Author: XComp

.github/workflows/mavenwrapper.yml

@@ -29,8 +29,8 @@ jobs:
             ./mvnw
             ./mvnw.cmd
       - name: Check Maven version in Unix-based systems
-        if: matrix.os != "windows-latest"
+        if: matrix.os != 'windows-latest'
         run: ./mvnw version
       - name: Check Maven version in Windows
-        if: matrix.os  == "windows-latest"
+        if: matrix.os  == 'windows-latest'
         run: ./mvnw.cmd version