Update server6.crt

Signed-off-by: Pengyu Lv <pengyu.lv@arm.com>
diff --git a/tests/data_files/server6.crt b/tests/data_files/server6.crt
index 6df6716..51e4393 100644
--- a/tests/data_files/server6.crt
+++ b/tests/data_files/server6.crt
@@ -1,14 +1,14 @@
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