Update security/botan2 to 2.4.0

• Fix build on aarch64
• While I'm here:
  • Strip shared library in post-install:
  • Do not silence installation message
  • Bump PORTREVISION of dependent ports for shlib change

Changes: https://botan.randombit.net/news.html
PR: 225085
Submitted by: Ralf van der Enden <tremere@cainites.net> (maintainer)