Update participants, and mark specs as updatable.

See [resolution](https://www.w3.org/2024/04/04-rdf-star-minutes.html#r02).

For w3c/rdf-star-wg#113.

Author: gkellogg

spec/common/participants.html

@@ -1 +1 @@
-Members of the RDF-star Working Group Group included Achille Zappa, Adrian Gschwend, Andy Seaborne, Antoine Zimmermann, Dan Brickley, David Chaves-Fraga, Dominik Tomaszuk, Dörthe Arndt, Enrico Franconi, Fabien Gandon, Gregg Kellogg, Gregory Williams, Jesse Wright, Jose Emilio Labra Gayo, Julián Arenas-Guerrero, Olaf Hartig, Ora Lassila, Pasquale Lisena, Peter Patel-Schneider, Pierre-Antoine Champin, Raphaël Troncy, Ruben Taelman, Rémi Ceres, Souripriya Das, Stuart Sutton, Ted Thibodeau, Thomas Pellissier Tanon, Timothée Haudebourg, and Vladimir Alexiev.
+Members of the RDF-star Working Group Group included Achille Zappa, Adrian Gschwend, Alan Snyder, Amin Anjomshoaa, Andy Seaborne, Antoine Zimmermann, Dan Brickley, Dave Raggett, Dominik Tomaszuk, Dörthe Arndt, Enrico Franconi, Erich Bremer, Fabien Gandon, Felix Sasaki, Gregg Kellogg, Gregory Williams, Jean-Yves Rossi, Jose Emilio Labra Gayo, Julián Arenas-Guerrero, Kurt Cagle, Niklas Lindström, Olaf Hartig, Ora Lassila, Pasquale Lisena, Peter Patel-Schneider, Pierre-Antoine Champin, Raphaël Troncy, Richard Lea, Ruben Taelman, Rémi Ceres, Souripriya Das, Ted Thibodeau Jr, Thomas Lörtsch, Thomas Pellissier Tanon, Timothée Haudebourg, and Vladimir Alexiev.

spec/index.html

@@ -363,7 +363,7 @@ <h2>Abstract</h2>
       </p>
     </section>
 
-    <section id="sotd" class="introductory">
+    <section id="sotd" class="introductory updateable-rec">
       <p>
         This specification is published by the
         <a href="https://www.w3.org/groups/wg/rdf-star">RDF Star Working Group</a> as part of the