One CI run tests ipython before backend mapping moved to mpl

.github/workflows/tests.yml

@@ -59,7 +59,8 @@ jobs:
             delete-font-cache: true
           - os: ubuntu-20.04
             python-version: 3.9
-            extra-requirements: '-r requirements/testing/extra.txt'
+            # One CI run tests ipython/matplotlib-inline before backend mapping moved to mpl
+            extra-requirements: '-r requirements/testing/extra.txt ipython<8.24 matplotlib-inline<0.1.7'
             CFLAGS: "-fno-lto"  # Ensure that disabling LTO works.
             # https://github.com/matplotlib/matplotlib/pull/26052#issuecomment-1574595954
             # https://www.riverbankcomputing.com/pipermail/pyqt/2023-November/045606.html
@@ -95,11 +96,6 @@ jobs:
             python-version: '3.12'
             # https://bugreports.qt.io/projects/PYSIDE/issues/PYSIDE-2346
             pyside6-ver: '!=6.5.1'
-          # Temporary CI run using pre-release IPython
-          - name-suffix: 'Pre-release IPython'
-            os: ubuntu-22.04
-            python-version: '3.12'
-            extra-requirements: '-r requirements/testing/extra.txt'
 
     steps:
       - uses: actions/checkout@v4
@@ -286,14 +282,6 @@ jobs:
             --index-url https://pypi.anaconda.org/scientific-python-nightly-wheels/simple \
             --upgrade --only-binary=:all: numpy pandas
 
-      - name: Install pre-release IPython
-        if: matrix.name-suffix == 'Pre-release IPython'
-        # Temporary, until release of IPython 8.24
-        run: |
-          pip list
-          pip install git+https://github.com/ipython/ipython@main
-          pip list
-
       - name: Install Matplotlib
         run: |
           ccache -s