Update the NLnet Labs RPKI Testbed TAL. (#922)

This PR updates the nlnetlabs-testbed TAL to the current version.

tals/nlnetlabs-testbed.tal

@@ -1,10 +1,10 @@
-https://testbed.rpki.nlnetlabs.nl/ta/ta.cer
-rsync://testbed.rpki.nlnetlabs.nl/ta/ta.cer
+https://testbed.krill.cloud/ta/ta.cer
+rsync://testbed.krill.cloud/ta/ta.cer
 
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-ywIDAQAB
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+t3i/+iNT2qJokKJBBuJf/AWrl/N1t+NPHNNHP2QplEnUX3TN7fi0fbNwp9qarXrP
+rwIDAQAB