Old setup-miniconda no longer works.

Use new setup-miniconda, but point to commit hash not yet included in a
release, so that we get the bugfix for the regression that was the
reason we were using the older one in the first place.

.github/workflows/release.yml

@@ -108,9 +108,10 @@ jobs:
           echo "CONDA_BUILD_ARGS=$CONDA_BUILD_ARGS" >> $GITHUB_ENV
 
       - name: Install Miniconda
-        # 2.0.1 until https://github.com/conda-incubator/setup-miniconda/pull/189 merged
-        # and released. Then can change to v2
-        uses: conda-incubator/setup-miniconda@v2.0.1
+        # We need https://github.com/conda-incubator/setup-miniconda/pull/189 in order
+        # to be able to install 32-bit miniconda on Windows. Once setup-miniconda 2.1.2
+        # is released with this fix, can change to @v2.
+        uses: conda-incubator/setup-miniconda@1a875d105ac03256664b54c882c8c374ce617ef6
         with:
           auto-update-conda: true
           python-version: ${{ matrix.python }}
@@ -238,9 +239,10 @@ jobs:
           password: ${{ secrets.pypi }}
 
       - name: Install Miniconda
-        # 2.0.1 until https://github.com/conda-incubator/setup-miniconda/pull/189 merged
-        # and released. Then can change to v2
-        uses: conda-incubator/setup-miniconda@v2.0.1
+        # We need https://github.com/conda-incubator/setup-miniconda/pull/189 in order
+        # to be able to install 32-bit miniconda on Windows. Once setup-miniconda 2.1.2
+        # is released with this fix, can change to @v2.
+        uses: conda-incubator/setup-miniconda@1a875d105ac03256664b54c882c8c374ce617ef6
         with:
           auto-update-conda: true