ci(test): Use python installation akin to other jobs.

.github/workflows/build_tests.yml

@@ -109,16 +109,27 @@ jobs:
 
         steps:
             - uses: "actions/checkout@v4"
-            - uses: excitedleigh/[email protected]
+            - name: "Set up Python"
+              uses: "actions/setup-python@v5"
+              with:
+                  python-version: |
+                    3.10
+                    3.11
+                    3.12
+
+            - name: "Install top-level dependencies"
+              run: |
+                  python -m pip install --upgrade pip
+                  python -m pip install nox poetry
+
             - uses: conda-incubator/setup-miniconda@v3
               with:
                 python-version: "${{ matrix.python-version }}"
                 conda-remove-defaults: "true"
 
             - name: "Install and update pip"
               run: |
-                  conda install -c conda-forge pip python=${{ matrix.python-version }} -y
-                  pip install --upgrade pip poetry
+                  conda install -c conda-forge pip "python=${{ matrix.python-version }}" -y
 
             - name: "Integration tests"
               run: nox -s build_tests_integration -x -- -vv