Update MARBL to latest tag

mnlevy1981 · mnlevy1981 · commit 43757e94243c · 2024-10-02T14:46:50.000-06:00
This tag refactors a computation that included a divide-by-0 under certain
forcing conditions (u10_sqr = 0, I believe).
diff --git a/.gitmodules b/.gitmodules
@@ -16,6 +16,6 @@
   path = externals/MARBL
   url = https://github.com/marbl-ecosys/MARBL.git
   fxDONOTUSEurl = https://github.com/marbl-ecosys/MARBL.git
-    fxtag = marbl0.47.1
+    fxtag = marbl0.48.0
     fxrequired = AlwaysRequired
 
diff --git a/externals/MARBL b/externals/MARBL
@@ -1 +1 @@
-Subproject commit 5db6529abae1fe6d363fb653baae37a5c73b6541
+Subproject commit 8cab038cf2f340467bbde442990cc5dcd0e6dbf3
