Update server3.crt and server4.crt

Signed-off-by: Pengyu Lv <pengyu.lv@arm.com>
diff --git a/tests/data_files/server3.crt b/tests/data_files/server3.crt
index ed0d696..46987c3 100644
--- a/tests/data_files/server3.crt
+++ b/tests/data_files/server3.crt
@@ -1,17 +1,15 @@
 -----BEGIN CERTIFICATE-----
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 -----END CERTIFICATE-----