Switch to branch that resolves flexric warnings

A number of warnings appear when compiling flexric with gcc-12, which we
use in the next commit. Those have been fixed upstream. Switch to the
updated version to avoid warnings.

flexric @ beabdd07

-Subproject commit f1c08ed2b9b1eceeda7941dd7bf435db0168dd56
+Subproject commit beabdd072ca9e381d4d27c9fbc6bb19382817489