MAINT: Remove unused

Author: HaoZeke

recipes/eon/recipe.yaml

@@ -55,7 +55,6 @@ requirements:
         - libtorch >=2.7,<2.8 cpu*
         - libmetatomic-torch >=0.1.2,<0.2
         - libmetatensor-torch
-        - vesin
     - eigen >=3.4,<3.5
     - libblas
     - libcblas
@@ -77,7 +76,6 @@ requirements:
         - libtorch >=2.7,<2.8 cpu*
         - libmetatomic-torch >=0.1.2,<0.2
         - libmetatensor-torch
-        - vesin
     - if: osx
       then: llvm-openmp