fix copyright note for cccamp23 drone pic

input/blog/2023/2023_09_07_cccamp23.md

@@ -487,7 +487,7 @@ And for the third time (CCCamp2019, MCH2022, CCCamp2023) I felt honored to be a
 
 <!--%
 lightgallery([
-    [ "img/cccamp23_bluemaex_51.jpeg", "Copyright @bluemaex. Used with permission." ],
+    [ "img/cccamp23_bluemaex_51.jpeg", "Copyright <a href='https://chaos.social/@th3r3al/110917982189942424'>@th3r3al</a>. Licensed as CC BY-NC-SA." ],
     [ "img/cccamp23_bluemaex_3.jpeg", "Copyright @bluemaex. Used with permission." ],
     [ "img/cccamp23_motu_25.jpg", "Copyright @motu81. Used with permission." ],
     [ "img/cccamp23_bluemaex_46.jpeg", "Copyright @bluemaex. Used with permission." ],