Add Bluesky handles for Patrick Chanezon and Julien Dubois (#115)

* Initial plan

* Add bluesky handle for Patrick Chanezon and Julien Dubois

Co-authored-by: sunix <650571+sunix@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: sunix <650571+sunix@users.noreply.github.com>

Author: Copilot

content/speakers/julien-dubois.md

@@ -1,6 +1,7 @@
 ---
 title: "Julien Dubois"
 twitter: "juliendubois"
+bluesky: "jdubois.bsky.social"
 ---
 
 Julien Dubois est Java Champion et Principal Manager chez Microsoft, où il dirige

content/speakers/patrick-chanezon.md

@@ -1,5 +1,6 @@
 ---
 title: "Patrick Chanezon"
+bluesky: "chanezon.bsky.social"
 ---
 
 Patrick Chanezon leads the Developer Relations team at Microsoft, helping developers and technology communities achieve more with AI on Microsoft Cloud.