Leak in SIO Frame reading

[tmadlener]

          Reading a frame with SIO is also not free from leaks and this is why it's commented out in the sanitizer tests, right? 

https://github.com/jmcarcell/podio/blob/main/tests/CTestCustom.cmake#L83-L83
Simply reading frames with SIO:

SUMMARY: AddressSanitizer: 7328 byte(s) leaked in 342 allocation(s).

The read_interface_sio.cpp test:

SUMMARY: AddressSanitizer: 7328 byte(s) leaked in 342 allocation(s).

so it doesn't have anything to do with the interface. I'll just add it to the list of excluded

Originally posted by @jmcarcell in #522 (comment)