Add FSL 6.0.7.20, 6.0.7.21, 6.0.7.22 to fsl template (#723)

Co-authored-by: Morgan Hough <morgan.hough@gmail.com>
Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: 3 people

neurodocker/templates/fsl.yaml

@@ -20,6 +20,9 @@ binaries:
             install_path: /opt/fsl-{{ self.version }}
             exclude_paths: ''
     urls:
+        6.0.7.22: https://fsl.fmrib.ox.ac.uk/fsldownloads/fslconda/releases/fslinstaller.py
+        6.0.7.21: https://fsl.fmrib.ox.ac.uk/fsldownloads/fslconda/releases/fslinstaller.py
+        6.0.7.20: https://fsl.fmrib.ox.ac.uk/fsldownloads/fslconda/releases/fslinstaller.py
         6.0.7.19: https://fsl.fmrib.ox.ac.uk/fsldownloads/fslconda/releases/fslinstaller.py
         6.0.7.18: https://fsl.fmrib.ox.ac.uk/fsldownloads/fslconda/releases/fslinstaller.py
         6.0.7.16: https://fsl.fmrib.ox.ac.uk/fsldownloads/fslconda/releases/fslinstaller.py