security/strongswan: fix CVE-2023-41913

This is urgent change adding official patch
https://download.strongswan.org/security/CVE-2023-41913/strongswan-5.9.7-5.9.11_charon_tkm_dh_len.patch
that is identical to the change made for strongswan-5.9.12:
https://github.com/strongswan/strongswan/commit/96d793718955820dfe5e6d8aa6127a34795ae39e

It is upto port maintainer to review and maybe upgrade the port to 5.9.12

Obtained from: strongSwan
Security: CVE-2023-41913