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/test-ca-good-alt.crt b/tests/data_files/test-ca-good-alt.crt
index 9edf4c2..f83a5ba 100644
--- a/tests/data_files/test-ca-good-alt.crt
+++ b/tests/data_files/test-ca-good-alt.crt
@@ -1,7 +1,7 @@
 -----BEGIN CERTIFICATE-----
-MIIDhzCCAm+gAwIBAgIBADANBgkqhkiG9w0BAQsFADA7MQswCQYDVQQGEwJOTDER
+MIIDhzCCAm+gAwIBAgIBAzANBgkqhkiG9w0BAQsFADA7MQswCQYDVQQGEwJOTDER
 MA8GA1UECgwIUG9sYXJTU0wxGTAXBgNVBAMMEFBvbGFyU1NMIFRlc3QgQ0EwHhcN
-MTcwNTA0MTY1NzAxWhcNMjcwNTA1MTY1NzAxWjA7MQswCQYDVQQGEwJOTDERMA8G
+MTkwMzEyMTAwMDEzWhcNMjkwMzEyMTAwMDEzWjA7MQswCQYDVQQGEwJOTDERMA8G
 A1UECgwIUG9sYXJTU0wxGTAXBgNVBAMMEFBvbGFyU1NMIFRlc3QgQ0EwggEiMA0G
 CSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQDA3zf8F7vglp0/ht6WMn1EpRagzSHx
 mdTs6st8GFgIlKXsm8WL3xoemTiZhx57wI053zhdcHgH057Zk+i5clHFzqMwUqny
@@ -11,32 +11,32 @@
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-CgwIUG9sYXJTU0wxGTAXBgNVBAMMEFBvbGFyU1NMIFRlc3QgQ0GCAQAwDAYDVR0T
-BAUwAwEB/zANBgkqhkiG9w0BAQsFAAOCAQEAHK/HHrTZMnnVMpde1io+voAtql7j
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-n20NRVA1Vjs6GAROr4NqW4k/+LofY9y0LLDE+p0oIEKXIsIvhPr39swxSA==
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+BAUwAwEB/zANBgkqhkiG9w0BAQsFAAOCAQEASucEO7JhpKL2pOA3C958VSJPpHIK
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+KH9DreGnCjJgN88wcnFGrUhLNnVG/w+EyFNyjwo4/96ttwWU00grTOQsxw==
 -----END CERTIFICATE-----
 -----BEGIN CERTIFICATE-----
 MIIDhzCCAm+gAwIBAgIBADANBgkqhkiG9w0BAQsFADA7MQswCQYDVQQGEwJOTDER
 MA8GA1UECgwIUG9sYXJTU0wxGTAXBgNVBAMMEFBvbGFyU1NMIFRlc3QgQ0EwHhcN
-MTcwNzAzMTU1MzQxWhcNMjcwNzA0MTU1MzQxWjA7MQswCQYDVQQGEwJOTDERMA8G
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++7/oa+et6+1UktN669P1BnNxLfY6J41P79+S+mA8gP4EA95/AObQyoUPpw==
 -----END CERTIFICATE-----