[ci] Update github action for v26.06

Author: epernod

.github/workflows/ci.yml

@@ -63,7 +63,7 @@ jobs:
 
       matrix:
         os: ${{ fromJSON(needs.prepare.outputs.os_list) }}
-        sofa_branch: [master]
+        sofa_branch: [v26.06]
 
     steps:
       #######################   Setup SOFA   #######################