Reorder pr-check.yml so specific pytest version installs after test-requirements

Author: Copilot

.github/workflows/pr-check.yml

@@ -172,18 +172,6 @@ jobs:
         with:
           python-version: ${{ matrix.python }}
 
-      - name: Install specific pytest version
-        if: matrix.pytest-version == 'pytest@pre-release'
-        run: |
-          python -m pip install --pre pytest
-
-      - name: Install specific pytest version
-        if: matrix.pytest-version != 'pytest@pre-release'
-        run: |
-          python -m pip install "${{ matrix.pytest-version }}"
-
-      - name: Install specific pytest version
-        run: python -m pytest --version
       - name: Install base Python requirements
         uses: brettcannon/pip-secure-install@92f400e3191171c1858cc0e0d9ac6320173fdb0c # v1.0.0
         with:
@@ -193,6 +181,19 @@ jobs:
       - name: Install test requirements
         run: python -m pip install --upgrade -r build/test-requirements.txt
 
+      # Install the specific pytest version AFTER test-requirements.txt so it is not
+      # overridden by the `pytest<8.1` pin (needed for pytest-black compatibility).
+      - name: Install specific pytest version (pre-release)
+        if: matrix.pytest-version == 'pytest@pre-release'
+        run: python -m pip install --upgrade --pre pytest
+
+      - name: Install specific pytest version
+        if: matrix.pytest-version != 'pytest@pre-release'
+        run: python -m pip install --upgrade "${{ matrix.pytest-version }}"
+
+      - name: Print pytest version
+        run: python -m pytest --version
+
       - name: Run Python unit tests
         run: python python_files/tests/run_all.py