update fsl-bet2 to version used in FSL 6.0.7.13

Author: psadil

env.yml

@@ -27,8 +27,8 @@ dependencies:
   - pandoc=3.1
   # Workflow dependencies: ANTs
   - ants=2.5
-  # Workflow dependencies: FSL (versions pinned in 6.0.7.7)
-  - fsl-bet2=2111.4
+  # Workflow dependencies: FSL (versions pinned in 6.0.7.13)
+  - fsl-bet2=2111.8
   - fsl-flirt=2111.2
   - fsl-fast4=2111.3
   - fsl-fugue=2201.4