Renew expired TLS test certificates (#972)

The server and client leaf certs in nats-core and nats expired on
2026-06-03, breaking every TLS and WebSocket test. Re-sign both with
the existing CA and keys, preserving subjects, SANs, and key usage, and
extend validity to 2035 (within the CA window) so this stops recurring
annually.

Author: caspervonb

nats-core/tests/certs/client-cert.pem

@@ -1,7 +1,7 @@
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 -----END CERTIFICATE-----

nats-core/tests/certs/server-cert.pem

@@ -1,7 +1,7 @@
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nats/tests/certs/client-cert.pem

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nats/tests/certs/server-cert.pem

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