Update server3.crt and server4.crt

Signed-off-by: Pengyu Lv <pengyu.lv@arm.com>
diff --git a/tests/data_files/server4.crt b/tests/data_files/server4.crt
index 96b1aa7..2b4134d 100644
--- a/tests/data_files/server4.crt
+++ b/tests/data_files/server4.crt
@@ -1,18 +1,17 @@
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 -----END CERTIFICATE-----