security/openvpn-devel: upgrade port to git commit 4281449ba4 (2.7_rc1, 2025-10-31)

This commit brings the port to "openvpn 2.7_rc1".

Changes of interest for FreeBSD:

    - even more type conversion related warnings have been fixed
    - more bugfixes related to BYTECOUNT display on the management
      interface and byte counters on DCO platforms in general
    - numerous minibugs reported by ZeroPath AI have been fixed
      (small memleaks, possible file descriptor leaks, improved
      sanity checks, add ASSERT() on function contracts, etc.)
    - add warning for unsupported combination of --push and --tls-server
    - add warning for unsupported combination of --reneg-bytes or
      --reneg-pkts with DCO
    - remove perf_push()/perf_pop() infrastructure (because it did not
      work anymore, and compiler profiling will give better results today)
    - ensure compatibility with OpenSSL 3.6.0 - specifically, do not crash
      in t_lpback.sh trying to use new encrypt-then-mac (ETM) ciphers
    - improved PUSH_UPDATE server side support, which now handles changes
      of pushed ifconfig/ifconfig-ipv6 addresses correctly (send packets
      to new IP addresses to this client, stop sending packets to the old
      addresses).
    - bugfixes reconnect and PUSH_UPDATE handling on the client side
      (notably handling of ifconfig/ifconfig-ipv6/redirect-gateway ipv6
      if the server is not always pushing the same address families)
    - improve CONTRIBUTING documentation
    - clean up and remove outdated stuff from COPYING
    - freshen URLs all over the tree, and change to HTTPS where possible
    - on DCO Linux/FreeBSD, add support for clients receiving an IPv4/IPv6
      address that is not part of the --server/--server-ipv6 subnet
      (= install extra on-interface host routes).
    - remove undocumented and unused --memstats feature
    - improve "recursive routing checks", prepare the way for a
      policy-based setup where "packets to VPN server" could end up
      in the tunnel without interfering with OpenVPN operations

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