test: Add Pydantic version to matrix variable (#890)

* test: Add Pydantic version to matrix variable

This is a follow-up to where the Pydantic v1 shim was added [1]. It's
inspired by Ray's approach [2].

This locks the version in the CI and I think that's okay since we
don't need to keep on updating them, as they're intended as smoke
tests.

[1] #882 (comment)
[2] ray-project/ray#40451

* build: Formatting

.github/workflows/ci.yml

@@ -35,9 +35,14 @@ jobs:
       matrix:
         os: [ ubuntu-latest ]
         python-version: [ '3.8', '3.9', '3.10', '3.11']
+        pydantic-version: [ '1.10.15', '2.7.1' ]
         include: # Run windows tests on only one python version
           - os: windows-latest
             python-version: '3.10' # torch 1.x not available on Windows or MacOS for Python 3.11
+            pydantic-version: '1.10.15'
+          - os: windows-latest
+            python-version: '3.10' # torch 1.x not available on Windows or MacOS for Python 3.11
+            pydantic-version: '2.7.1'
 
     steps:
       - name: Checkout code
@@ -52,6 +57,7 @@ jobs:
         run: |
           python -m pip install --upgrade pip setuptools wheel
           python -m pip install --upgrade --upgrade-strategy eager -r requirements/dev.txt
+          python -m pip install --upgrade pydantic==${{matrix.pydantic-version}}
           python -m pip install --upgrade --upgrade-strategy eager .[prophet,tensorflow,torch]
           if [ "$RUNNER_OS" == "Linux" ]; then  # Currently, we only support KeOps on Linux.
             python -m pip install --upgrade --upgrade-strategy eager .[prophet,tensorflow,torch,keops]
@@ -67,7 +73,7 @@ jobs:
       - name: Test with pytest
         run: |
           pytest --randomly-seed=0 alibi_detect
-          # Note: The pytest-randomly seed is fixed at 0 for now. Once the legacy np.random.seed(0)'s 
+          # Note: The pytest-randomly seed is fixed at 0 for now. Once the legacy np.random.seed(0)'s
           # are removed from tests, this can be removed, allowing all tests to use random seeds.
 
       - name: Upload coverage to Codecov