fix(CellBudgetFile): trap OSError when detecting precision (#2772)

Fix the precision detection issue mentioned in MODFLOW-ORG/modflow6#2838 (comment)

Author: wpbonelli

flopy/utils/binaryfile/__init__.py

@@ -2427,7 +2427,7 @@ def _set_precision(self, precision="single"):
 
         try:
             self._build_index()
-        except (BudgetIndexError, EOFError) as e:
+        except (BudgetIndexError, EOFError, OSError) as e:
             success = False
             self.__reset()