fix python version

Author: jan-janssen

.github/workflows/deploy.yml

@@ -19,6 +19,13 @@ jobs:
       id-token: write
     steps:
     - uses: actions/checkout@v4
+    - name: Conda config
+      run: echo -e "channels:\n  - conda-forge\n" > .condarc
+    - uses: conda-incubator/setup-miniconda@v3
+      with:
+        python-version: "3.12"
+        miniforge-version: latest
+        condarc-file: .condarc
     - name: Build
       shell: bash -l {0}
       run: |