Bump checkstyle from 8.27 to 8.28 (#5794)

* Bump checkstyle from 8.27 to 8.28

Bumps [checkstyle](/~https://github.com/checkstyle/checkstyle) from 8.27 to 8.28.
- [Release notes](/~https://github.com/checkstyle/checkstyle/releases)
- [Commits](checkstyle/checkstyle@checkstyle-8.27...checkstyle-8.28)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

* Remove removed properties

* Update checkstyle.xml

Co-authored-by: Tobias Diez <tobiasdiez@gmx.de>

build.gradle

@@ -225,7 +225,7 @@ dependencies {
     testCompile "org.testfx:testfx-junit5:4.0.17-alpha-SNAPSHOT"
     testCompile "org.hamcrest:hamcrest-library:2.2"
 
-    checkstyle 'com.puppycrawl.tools:checkstyle:8.27'
+    checkstyle 'com.puppycrawl.tools:checkstyle:8.28'
     xjc group: 'org.glassfish.jaxb', name: 'jaxb-xjc', version: '2.3.2'
     jython 'org.python:jython-standalone:2.7.1'
 }

config/checkstyle/checkstyle.xml

@@ -20,11 +20,8 @@
         <!-- Checks for Javadoc comments: https://checkstyle.org/config_javadoc.html -->
         <module name="InvalidJavadocPosition"/>
         <module name="JavadocMethod">
-            <property name="allowUndeclaredRTE" value="true"/>
             <property name="allowMissingParamTags" value="true"/>
-            <property name="allowMissingThrowsTags" value="true"/>
             <property name="allowMissingReturnTag" value="true"/>
-            <property name="validateThrows" value="true"/>
         </module>
 
         <!-- Checks for imports: https://checkstyle.org/config_import.html -->