Increase ABI version
Increase ABI version

Already we broke ABI in 2.1 but did not bump the soversion
(see comments in https://github.com/randombit/botan/commit/7bdffd52a96e08e9452d1985258376a3925a497b)
and 2.2 again changes ABI for example by adding HashFunction::copy_state
function.

[ci skip]

webmaster128/botan,randombit/botan,Rohde-Schwarz-Cybersecurity/botan,Rohde-Schwarz-Cybersecurity/botan,randombit/botan,randombit/botan,Rohde-Schwarz-Cybersecurity/botan,webmaster128/botan,Rohde-Schwarz-Cybersecurity/botan,webmaster128/botan,Rohde-Schwarz-Cybersecurity/botan,webmaster128/botan,Rohde-Schwarz-Cybersecurity/botan,randombit/botan,webmaster128/botan,randombit/botan