chore: upgrade license-checker to 2.0.0-beta6 (#7960) (#7967)

Co-authored-by: Zhe Sun <[email protected]>

Author: vaadin-bot

vaadin-spreadsheet-flow-parent/vaadin-spreadsheet-flow/pom.xml

@@ -30,7 +30,7 @@
         <dependency>
             <groupId>com.vaadin</groupId>
             <artifactId>license-checker</artifactId>
-            <version>2.0.0-beta4</version>
+            <version>2.0.0-beta6</version>
             <scope>provided</scope>
         </dependency>
         <dependency>