ci: update build index for apple builds

Author: jgriffiths

gitlab/common.yml

@@ -56,7 +56,7 @@
     # is left in an unconsistent state, just change the BUILD_IDX and you are good to go.
 .osx_env:
   variables:
-    BUILD_IDX: "0"
+    BUILD_IDX: "1"
     GDK_KEEP_DOWNLOADS: "1"
   before_script:
     - idx=($(shasum tools/* cmake/profiles/* | shasum))