CI: Add workflow testing against NumPy v2

.github/workflows/ci_np2.yml

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+name: conda-build (NumPy v2)
+
+on: [push]
+
+jobs:
+  build-linux:
+    runs-on: ubuntu-latest
+    strategy:
+      max-parallel: 5
+
+    steps:
+    - uses: actions/checkout@v4
+    - name: Set up Python
+      uses: actions/setup-python@v3
+      with:
+        python-version: '3.12'
+    - name: Add conda to system path
+      run: |
+        # $CONDA is an environment variable pointing to the root of the miniconda directory
+        echo $CONDA/bin >> $GITHUB_PATH
+    - name: Install dependencies
+      run: |
+        conda env update --file environment_np2.yml --name base
+    - name: Test with pytest
+      run: |
+        conda install pytest
+        pytest

environment_np2.yml

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+name: qe
+channels:
+  - conda-forge
+  - defaults
+dependencies:
+  - coverage
+  - numpy>=2
+  - scipy
+  - pandas
+  - numba
+  - sympy
+  - ipython
+  - flake8
+  - requests
+  - urllib3>=2
+  - flit
+  - chardet # python>3.9,osx
+  - pytest