Update CA cert with CRL Sign key usage

Same key, added CRL Sign to key usage extensions. Distributed to
all nodes and NixOS system trust store.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

certs/wntrmute-ca.pem

@@ -1,18 +1,19 @@
 -----BEGIN CERTIFICATE-----
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++9BVX/eRjM6rZusXGguuvKbCXAyQ/eJH1wUelgDbE8qtFa884U8eqiod2NUpZXWr
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+lU5ZyOXooeM0ZDZOn0Y4GOsXPx0LVD7PE3pHSkbxGpA=
 -----END CERTIFICATE-----
+