MNT add python 3.13 tests

.github/workflows/build-test.yml

@@ -11,12 +11,12 @@ concurrency:
 jobs:
   pytest:
     runs-on: ${{ matrix.os }}
-    if: "github.repository == 'skops-dev/skops'"
+    if: github.repository == 'skops-dev/skops'
     strategy:
       fail-fast: false # need to see which ones fail
       matrix:
-        os: [ubuntu-latest, windows-latest, macos-12]
-        python: ["3.9", "3.10", "3.11", "3.12"]
+        os: [ubuntu-latest, windows-latest, macos-latest]
+        python: ["3.9", "3.10", "3.11", "3.12", "3.13"]
         # this is to make the CI run on different sklearn versions
         include:
           - python: "3.9"
@@ -29,6 +29,9 @@ jobs:
             sklearn_version: "1.4"
             numpy_version: "numpy"
           - python: "3.12"
+            sklearn_version: "1.5"
+            numpy_version: "numpy"
+          - python: "3.13"
             sklearn_version: "nightly"
             numpy_version: "numpy"
 
@@ -57,6 +60,9 @@ jobs:
       - name: Install dependencies
         run: |
           python -m pip install -U pip
+          if [ "${{ matrix.os }}" == "macos-latest" ]; then
+            brew install libomp
+          fi
           pip install "pytest<8"
           pip install "${{ matrix.numpy_version }}"
           if [ ${{ matrix.sklearn_version }} == "nightly" ];