replace 512 bit dh key with a 2014 bit one (closes #23844)

Patch by Cédric Krier.
diff --git a/Lib/test/dh1024.pem b/Lib/test/dh1024.pem
new file mode 100644
index 0000000..a391176
--- /dev/null
+++ b/Lib/test/dh1024.pem
@@ -0,0 +1,7 @@
+-----BEGIN DH PARAMETERS-----
+MIGHAoGBAIbzw1s9CT8SV5yv6L7esdAdZYZjPi3qWFs61CYTFFQnf2s/d09NYaJt
+rrvJhIzWavqnue71qXCf83/J3nz3FEwUU/L0mGyheVbsSHiI64wUo3u50wK5Igo0
+RNs/LD0irs7m0icZ//hijafTU+JOBiuA8zMI+oZfU7BGuc9XrUprAgEC
+-----END DH PARAMETERS-----
+
+Generated with: openssl dhparam -out dh1024.pem  1024