ci: use setup-miniconda@v3

Author: fabinsch

.github/workflows/ci-linux-osx-win-conda.yml

@@ -57,7 +57,7 @@ jobs:
       with:
         submodules: recursive
 
-    - uses: conda-incubator/setup-miniconda@v2
+    - uses: conda-incubator/setup-miniconda@v3
       if: matrix.os != 'macos-14'
       with:
         miniforge-variant: Mambaforge