Test compile jsp not working with target/source 11

### Apache NetBeans version

Apache NetBeans 19

### What happened

After migrating my project on java 11, I can't build the project with the option "Test compile all JSP files during build".

Whit this flag off the build ends without errors. But with flag on, I get the error:

```
Exception in thread "main" java.lang.IllegalArgumentException: PWC6309: Illegal compilerSourceVM: 11
at org.apache.jasper.JspC.setCompilerSourceVM(JspC.java:684)
at org.netbeans.modules.web.project.ant.JspC.main(JspC.java:55)
C:\Users\andre\Work\Projects\EramCore2\Eram\nbproject\build-impl.xml:927: Java returned: 1
BUILD FAILED (total time: 15 seconds)
```
My java distribution is Corretto-11.0.12.7.1

### How to reproduce

1. Create a new project: Java with Ant -> JavaWeb -> WebApplication
2. Select Tomcat as target server (in my case Tomcat 9.0.82)
3. Select Java EE 8 Web as Java EE Version
4. Complete the wizard
6. Right click on project and select properties: enable "Test compile all JSP files during build" in Build -> Compiling
5. Create a new jsp
6. Build the project

### Did this work correctly in an earlier version?

No / Don't know

### Operating System

Windows 11

### JDK

JDK 11

### Apache NetBeans packaging

Apache NetBeans provided installer

### Anything else

_No response_

### Are you willing to submit a pull request?

No

Start with nbproject/build-impl.xml around line 927 and the org.netbeans.modules.web.project.ant.JspC entry point mentioned in the stack trace. Reproduce the Java 11 web project build with JSP test compilation enabled and trace the PWC6309 compilerSourceVM error; done means the JSP compilation completes successfully for the described configuration.

Written by the indexing model from the issue text.