Add FFmpeg-6.0-GCCcore-12.3.0.eb

Author: Neves-P

easystacks/software.eessi.io/2023.06/eessi-2023.06-eb-4.8.2-2023a.yml

@@ -32,3 +32,4 @@ easyconfigs:
   - R-4.3.2-gfbf-2023a.eb:
       options:
         from-pr: 19185
+  - FFmpeg-6.0-GCCcore-12.3.0.eb