doc: set the RFC date to when generated

until it goes on to datatracker, this keeps me from having to bump the
date periodically to prevent it from expiring.

Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
diff --git a/doc/draft-bottomley-tpm2-keys.xml b/doc/draft-bottomley-tpm2-keys.xml
index db58618..7f6da22 100644
--- a/doc/draft-bottomley-tpm2-keys.xml
+++ b/doc/draft-bottomley-tpm2-keys.xml
@@ -23,7 +23,7 @@
         <email>James.Bottomley@HansenPartnership.com</email>
       </address>
     </author>
-    <date month="December" year="2023"/>
+    <date />
     <area>Security</area>
     <keyword>I-D</keyword>
     <keyword>Internet-Draft</keyword>