Update certificates to expire in 2029

Update certificates that expire on 2021, to prolong their validity,
to make tests pass three years ahead.
diff --git a/tests/data_files/cli2.crt b/tests/data_files/cli2.crt
index 2dfa516..f287a19 100644
--- a/tests/data_files/cli2.crt
+++ b/tests/data_files/cli2.crt
@@ -1,14 +1,13 @@
 -----BEGIN CERTIFICATE-----
-MIICLDCCAbKgAwIBAgIBDTAKBggqhkjOPQQDAjA+MQswCQYDVQQGEwJOTDERMA8G
-A1UEChMIUG9sYXJTU0wxHDAaBgNVBAMTE1BvbGFyc3NsIFRlc3QgRUMgQ0EwHhcN
-MTMwOTI0MTU1MjA0WhcNMjMwOTIyMTU1MjA0WjBBMQswCQYDVQQGEwJOTDERMA8G
-A1UEChMIUG9sYXJTU0wxHzAdBgNVBAMTFlBvbGFyU1NMIFRlc3QgQ2xpZW50IDIw
-WTATBgcqhkjOPQIBBggqhkjOPQMBBwNCAARX5a6xc9/TrLuTuIH/Eq7u5lOszlVT
-9jQOzC7jYyUL35ji81xgNpbA1RgUcOV/n9VLRRjlsGzVXPiWj4dwo+THo4GdMIGa
-MAkGA1UdEwQCMAAwHQYDVR0OBBYEFHoAX4Zk/OBd5REQO7LmO8QmP8/iMG4GA1Ud
-IwRnMGWAFJ1tICRJAT8ry3i1Gbx+JMnb+zZ8oUKkQDA+MQswCQYDVQQGEwJOTDER
-MA8GA1UEChMIUG9sYXJTU0wxHDAaBgNVBAMTE1BvbGFyc3NsIFRlc3QgRUMgQ0GC
-CQDBQ+J+YkPM6DAKBggqhkjOPQQDAgNoADBlAjBKZQ17IIOimbmoD/yN7o89u3BM
-lgOsjnhw3fIOoLIWy2WOGsk/LGF++DzvrRzuNiACMQCd8iem1XS4JK7haj8xocpU
-LwjQje5PDGHfd3h9tP38Qknu5bJqws0md2KOKHyeV0U=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 -----END CERTIFICATE-----