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/enco-ca-prstr.pem b/tests/data_files/enco-ca-prstr.pem
index 6503314..80e2aeb 100644
--- a/tests/data_files/enco-ca-prstr.pem
+++ b/tests/data_files/enco-ca-prstr.pem
@@ -1,14 +1,15 @@
 -----BEGIN CERTIFICATE-----
-MIICDTCCAXagAwIBAgIETZt8lzANBgkqhkiG9w0BAQUFADBCMUAwPgYDVQQDEzdP
-cGVuVlBOIFdlYiBDQSAyMDExLjA0LjA1IDIwOjMzOjI3IFVUQyBhc2RlbW8ueW9u
-YW4ubmV0MB4XDTExMDMyOTIwMzMyN1oXDTIxMDQwMjIwMzMyN1owQjFAMD4GA1UE
-AxM3T3BlblZQTiBXZWIgQ0EgMjAxMS4wNC4wNSAyMDozMzoyNyBVVEMgYXNkZW1v
-LnlvbmFuLm5ldDCBnzANBgkqhkiG9w0BAQEFAAOBjQAwgYkCgYEA38U3wA/eTGN/
-/AJHo2OsEHjLdO9k3Mo5QcShvg+6IoAThD7HEyOYm4Ild8s4+eEy2i9ecWvMKG6M
-YSO+GwG9xOd9wDFtODpF+z6rIt8a4bLbQHcsp9Ccu+ZmjxkJkmxOCz774lxETArX
-SaksAB5P6Web/LwKUv/Iy9crRM9HzSECAwEAAaMQMA4wDAYDVR0TBAUwAwEB/zAN
-BgkqhkiG9w0BAQUFAAOBgQARCDFYCb9n151hgwitxzbuacIVDqIH8EouV2VBqlNR
-tj8q1maliDE3pW7WRAwMi5i3+5c0auKwhTGESsBPjasd5QnjqXOkRbcZhkeVQ1ln
-6NEn6xC+M+H2LGVHSSropcGa8olLlo98LrsFuHVHMewTs7SK2lc+7rU/ILec3ymj
-og==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 -----END CERTIFICATE-----