fix: Update to JDK21 - EXO-71474 - Meeds-io/MIPs#91

Remove SecurityManager from Kernel as it is deprecated for removal in jdk21
Remove also classes
- SecurityHelper
- PrivilegedSystemHelper
- PrivilegedFileHelper
- SecureList
- SecureSet
- SecureCollections

These classes are here only to use securityManager, and as it is removed, it is no more necessary

Resolves Meeds-io/MIPs#91

exo.kernel.component.cache/pom.xml

@@ -64,7 +64,7 @@
             <groupId>org.apache.maven.plugins</groupId>
             <artifactId>maven-surefire-plugin</artifactId>
             <configuration>
-                <argLine>@{argLine} @{surefire.argLine} -Djava.net.preferIPv4Stack=true</argLine>
+                <argLine>@{argLine} -Djava.net.preferIPv4Stack=true</argLine>
                 <systemProperties>
                   <!-- Avoid the firewall -->
                   <property>

exo.kernel.component.common/pom.xml

@@ -140,7 +140,7 @@
             <groupId>org.apache.maven.plugins</groupId>
             <artifactId>maven-surefire-plugin</artifactId>
             <configuration>
-                <argLine>@{argLine} @{surefire.argLine} -Djava.net.preferIPv4Stack=true</argLine>
+                <argLine>@{argLine} -Djava.net.preferIPv4Stack=true</argLine>
                 <systemProperties>
                   <!-- Avoid the firewall -->
                   <property>

exo.kernel.component.ext.cache.impl.infinispan.v8/pom.xml

@@ -95,7 +95,7 @@
 				<groupId>org.apache.maven.plugins</groupId>
 				<artifactId>maven-surefire-plugin</artifactId>
 				<configuration>
-            <argLine>@{argLine} @{surefire.argLine} -Djava.net.preferIPv4Stack=true</argLine>
+            <argLine>@{argLine} --add-opens=java.base/java.util=ALL-UNNAMED --add-opens=java.base/java.util.concurrent=ALL-UNNAMED  -Djava.net.preferIPv4Stack=true</argLine>
 					<systemProperties>
 						<!-- Avoid the firewall -->
 						<property>