Do not run Conda test GHA on MacOS ARM64

Do not run the Conda environment test on MacOS ARM64, as the `subread`
package is not available there.

.github/workflows/setup.yml

@@ -27,6 +27,9 @@ jobs:
             cmd: jupyter nbconvert --to HTML tutorials/jupyter/supplementary_material.ipynb
           - env: quarto
             cmd: conda install -c conda-forge quarto && conda install -c conda-forge deno && export QUARTO_DENO=$(which deno) && quarto render tutorials/quarto/quarto-tutorial-example.qmd --to html
+        exclude:
+          - os: macos-latest
+            env: [snakemake, nextflow]
     steps:
       - name: Checkout
         uses: actions/checkout@v4