Torchani has had recent updates that has change the call for the hessian function in torchani.utils

Since we unrestricted the installation of torchani, it would download the latest version as well as pythoin 3.13, thus breaking our tests:
`AttributeError: module 'torchani.utils' has no attribute 'hessian'`

Author: calvinp0

devtools/install_torchani.sh

@@ -1,5 +1,5 @@
 #!/usr/bin/env bash
-set -euo pipefail
+set -eo pipefail
 
 # Enable tracing of each command, but tee it to a logfile
 exec 3>&1 4>&2

devtools/tani_environment.yml

@@ -4,14 +4,14 @@ channels:
   - conda-forge
   - defaults
 dependencies:
-  - python
-  - numpy
+  - python =3.10.8
+  - numpy =1.24
   - pandas
   - ase
-  - torchani >=2.2.3
-  - pytorch
-  - torchvision
-  - torchaudio
+  - torchani =2.2
+  - pytorch =1.13.1
+  - torchvision =0.14.1
+  - torchaudio =0.13.1
   - cpuonly
   - scikit-learn
   - matplotlib