Update commons-fileupload2 to 2.0.0-M2

Hi all,

There is a new milestone for commons-fileupload (M2):

https://github.com/apache/commons-fileupload/blob/master/RELEASE-NOTES.txt

They decided to split servlet support into two modules:

- commons-fileupload2-jakarta-servlet5
- commons-fileupload2-jakarta-servlet6

We should probably upgrade to this new release before releasing Wicket 10
because the upgrade requires changes to imports:

org.apache.commons.fileupload2.jakarta.JakartaServletRequestContext ->
org.apache.commons.fileupload2.jakarta.servlet6.JakartaServletRequestContext

Which servlet version are we planning to support for Wicket 10? The
migration page currently says 5.0+, so we should probably use the jakarta5
module? I'm not sure though.

Any thoughts?