Update JUnit 6.0.0 (#109)

Author: offa

test/gha-test/pom.xml

@@ -12,12 +12,12 @@
     <description>Test for Maven Action.</description>
 
     <properties>
-        <java.level>11</java.level>
-        <maven.compiler.source>11</maven.compiler.source>
-        <maven.compiler.target>11</maven.compiler.target>
+        <java.level>17</java.level>
+        <maven.compiler.source>17</maven.compiler.source>
+        <maven.compiler.target>17</maven.compiler.target>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 
-        <junit.version>5.13.4</junit.version>
+        <junit.version>6.0.0</junit.version>
     </properties>
 
     <build>