MFH: r558208

security/i2p: Update to 0.9.48

Changelog:

https://geti2p.net/en/blog/post/2020/11/30/0.9.48-Release

PR: 251595
Submitted by: Michael Muenz <m.muenz@gmail.com> (maintainer)

Approved by: ports-secteam bugfix blanket