[Bug 298263] Tons of networking test failures on stable/15: scapy DeprecationWarning gone awry

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=298263

            Bug ID: 298263
           Summary: Tons of networking test failures on stable/15: scapy
                    DeprecationWarning gone awry
           Product: Base System
           Version: 15.1-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: tests
          Assignee: testing@FreeBSD.org
          Reporter: ngie@FreeBSD.org

One of the many samples from
https://ci.freebsd.org/job/FreeBSD-stable-15-amd64-test/1085/testReport/junit/
:
```
Fail: stderr not empty
--- /dev/null   2026-09-07 06:57:35.637318000 +0000
+++ /tmp/kyua.Fw0JRZ/9042/work/check.O2nHb8/stderr      2026-09-07
06:57:35.632108000 +0000
@@ -0,0 +1,2 @@
+/usr/local/lib/python3.12/site-packages/scapy/layers/tls/crypto/groups.py:25:
CryptographyDeprecationWarning: Diffie-Hellman over finite fields (FFDH) is
deprecated and support will be removed in a future release. Use a more modern
key exchange algorithm.
+  from cryptography.hazmat.primitives.asymmetric.dh import DHParameterNumbers
Files left in work directory after failure: .cache, .config,
created_interfaces.lst, created_jails.lst, inetd_1.pid, inetd_2.pid,
tmp.lQBcKqSZHH
```
This isn't happening on :main, so my guess is that an MFC is missing...

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