mnt: pin libitk for ants

Author: oesteban

.github/workflows/test.yml

@@ -115,7 +115,7 @@ jobs:
           # Override libiconv pre-installed from anaconda channel
           # See https://github.com/conda-forge/libitk-feedstock/issues/98
           # Since we're not creating a new environment, we must be explicit
-          conda install -c conda-forge ants=2.4 libiconv
+          conda install -c conda-forge ants=2.4 libitk=5.3 libiconv
       - name: Verify antsRegistration path
         run: |
           export PATH=$ANTSPATH:$PATH

AGENTS.md

@@ -29,7 +29,7 @@ The project's source code lives under `src/nifreeze/` and tests under `tests/`.
 
 - Some software needs to be installed prior to testing, for example ANTs
   ```
-  conda install -c conda-forge ants=2.4 libiconv
+  conda install -c conda-forge ants=2.4 libitk=5.3 libiconv
   ```
 - Notebooks generate figures with latex commands inside, therefore:
   ```