Fix find_ysoserial_offsets.rb and incorrect serialVersionUID patching

[wvu]

/find_ysoserial_offsets.rb:39:in `generate_payload': undefined local variable or method `ysoserial_modified' for main:Object (NameError)
	from /find_ysoserial_offsets.rb:140:in `block in <main>'
	from /find_ysoserial_offsets.rb:137:in `each'
	from /find_ysoserial_offsets.rb:137:in `<main>'

Invalid payload type 'Payload'

Invalid payload type '-------'

I did not update data/ysoserial_payloads.json because it seems to break the CommonsBeanutils1 payload used in exploit/windows/http/desktopcentral_deserialization. We will have to address that in a later PR.

Fixes #11125 and #13071. See also: #11359.

[wvu]

This won't work if the CommonsBeanutils1 payload in data/ysoserial_payloads.json is updated, nor will it work for other payloads in that file. I was mistaken about the frequency and distribution of serialVersionUID.

[wvu]

This should still work if the offset doesn't change after updating the CommonsBeanutils1 payload in data/ysoserial_payloads.json. However, the updated payload seems to be breaking for me regardless, so I'm not updating the file in this PR. We will have to address that later.

[smcintyre-r7]

Retested with the windows/http/desktopcentral_deserialization module and the tools/payloads/ysoserial./runme.sh tool. Both are working, with the module yielding a session and the tool updating the JSON data file. Thanks @wvu-r7 ! I'll land this in a moment.

[smcintyre-r7]

Release Notes

This fixes a bug in the tool workflow which generates the data files for YSoSerial Java payloads.