srtp: 2.1.0 -> 2.2.0 (#40849)

Semi-automatic update generated by https://github.com/ryantm/nixpkgs-update tools.

This update was made based on information from https://repology.org/metapackage/libsrtp/versions.

These checks were done:

- built on NixOS

- 0 of 0 passed binary check by having a zero exit code.
- 0 of 0 passed binary check by having the new version present in output.
- found 2.2.0 with grep in /nix/store/6zbhr84zjcsvn8rjngwyqlhy1592pbcm-libsrtp-2.2.0
- directory tree listing: https://gist.github.com/87b0811e10da29e42c97917be0858d86
- du listing: https://gist.github.com/2e969bdfee6739383f70f7509c074b3b