Update action.yml

Author: SilkeSchomann

.github/actions/publish-package/action.yml

@@ -24,7 +24,7 @@ runs:
       conda config --set always_yes yes --set changeps1 no
       conda create -n build-env
       conda activate build-env
-      mamba install -c conda-forge mamba conda-build anaconda-client conda-verify boa
+      mamba install -c conda-forge mamba conda-build anaconda-client conda-verify boa setuptools=75.1.0
       conda config --add channels mantid/label/nightly
       conda config --add channels mantid