fix: no autoescape for bluesheet template (#9858)

Author: jennifer-richards

ietf/templates/meeting/bluesheet.txt

@@ -1,7 +1,8 @@
-Bluesheet for {{session}}
+{% autoescape off %}Bluesheet for {{session}}
 ========================================================================
 
 {{ data|length }} attendees.
 
 {% for item in data %}
 {{ item.name }}	{{ item.affiliation }}{% endfor %}
+{% endautoescape %}