srtp 1.5.0

The updated shared library is courtesy Nirbheek Chauhan. Original patch:

https://github.com/nirbheek/cerbero/blob/openwebrtc/recipes/libsrtp/shared-library.patch

Closes #34506.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
srtp: add 1.5 bottle.