spicy: Do not install pre-commit (#12344)

We do not need pre-commit for fuzzing. Installing it via pip raises
pip._vendor.pep517.wrappers.BackendUnavailable due to some dependency.
Drop it, as it's not needed.

I don't think we need btest either unless for installing the packages
via zkg, so keeping that one for now.

projects/spicy/Dockerfile

@@ -44,7 +44,7 @@ RUN apt-get update \
     python3-sphinx-rtd-theme \
     python3-setuptools \
     python3-wheel doxygen \
- && pip3 install --no-cache-dir "btest>=0.66" pre-commit \
+ && pip3 install --no-cache-dir "btest>=0.66" \
  # Install a recent CMake.
  && mkdir -p /opt/cmake \
  && curl -L https://github.com/Kitware/CMake/releases/download/v3.29.2/cmake-3.29.2-linux-x86_64.tar.gz | tar xzvf - -C /opt/cmake --strip-components 1 \