tests: Update embedded Let's Encrypt cert

Signed-off-by: Albin Kerouanton <albinker@gmail.com>

tlsconfig/config_test.go

@@ -13,36 +13,40 @@ import (
 )
 
 // This is the currently active Let’s Encrypt R3 (RSA 2048, O = Let's Encrypt, CN = R3)
-// cross-signed CA Intermediate cert, downloaded from: https://letsencrypt.org/certs/lets-encrypt-r3-cross-signed.pem
-// It expires Sep 29 19:21:40 2021 GMT
+// CA Intermediate cert, downloaded from: https://letsencrypt.org/certs/lets-encrypt-r3.pem
+// It expires Sep 15 16:00:00 2025 GMT
 // download updated versions from https://letsencrypt.org/certificates/
 const (
 	systemRootTrustedCert = `
 -----BEGIN CERTIFICATE-----
-MIIEZTCCA02gAwIBAgIQQAF1BIMUpMghjISpDBbN3zANBgkqhkiG9w0BAQsFADA/
-MSQwIgYDVQQKExtEaWdpdGFsIFNpZ25hdHVyZSBUcnVzdCBDby4xFzAVBgNVBAMT
-DkRTVCBSb290IENBIFgzMB4XDTIwMTAwNzE5MjE0MFoXDTIxMDkyOTE5MjE0MFow
-MjELMAkGA1UEBhMCVVMxFjAUBgNVBAoTDUxldCdzIEVuY3J5cHQxCzAJBgNVBAMT
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-/xMY6pgJdz+dU/nPAeX1pnAXFK9jpP+Zs5Od3FOnBv5IhR2haa4ldbsTzFID9e1R
-oYvbFQIDAQABo4IBaDCCAWQwEgYDVR0TAQH/BAgwBgEB/wIBADAOBgNVHQ8BAf8E
-BAMCAYYwSwYIKwYBBQUHAQEEPzA9MDsGCCsGAQUFBzAChi9odHRwOi8vYXBwcy5p
-ZGVudHJ1c3QuY29tL3Jvb3RzL2RzdHJvb3RjYXgzLnA3YzAfBgNVHSMEGDAWgBTE
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-r52LFMLGMB0GA1UdJQQWMBQGCCsGAQUFBwMBBggrBgEFBQcDAjANBgkqhkiG9w0B
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-UdHkhVNcsAKX1H7GNNLOEADksd86wuoXvg==
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+nLRbwHOoq7hHwg==
 -----END CERTIFICATE-----
 `
 	rsaPrivateKeyFile             = "fixtures/key.pem"