Add --ignore-installed to CI pip install

Some apt-shipped Python packages on the ubuntu-24.04 runner (e.g.
python3-typing-extensions) lack RECORD files, so pip refuses to
uninstall them when a newer version is needed. Tell pip to overlay
the requested versions without uninstalling, mirroring how other CI
runners on PEP 668 systems handle this.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: Dobiasd

.github/workflows/ci.yml

@@ -12,7 +12,7 @@ jobs:
           # system libs
           sudo apt-get install libblas-dev liblapack-dev libatlas-base-dev gfortran
           # python libs
-          sudo pip3 install --break-system-packages numpy scipy h5py "tensorflow==2.21.0" "keras==3.14.0"
+          sudo pip3 install --break-system-packages --ignore-installed numpy scipy h5py "tensorflow==2.21.0" "keras==3.14.0"
           echo "Python version:"
           python3 --version
           echo "Version numbers of TensorFlow and Keras:"