Update Michael Vitz

Author: mvitz

java-champions.yml

@@ -3036,6 +3036,13 @@ members:
     city: Moenchengladbach
     social:
       twitter: https://twitter.com/michaelvitz
+      mastodon: https://innoq.social/@michaelvitz
+      bluesky: https://bsky.app/profile/michaelvitz.bsky.social
+      youtube: https://www.youtube.com/@michael-on-code
+      linkedin: https://www.linkedin.com/in/michaelvitz/
+      github: https://github.com/mvitz
+      website: https://mvitz.de
+      sessionize: https://sessionize.com/michaelvitz/
     avatar: img/avatars/michaelvitz.png
   - name: Lars Vogel
     year: 2012