try to install only binaries

.github/workflows/python-package.yml

@@ -28,7 +28,7 b' jobs:'
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
-        pip install darker==1.5.1 black==22.10.0
+        pip install --only-binary ':all:' darker==1.5.1 black==22.10.0
     - name: Lint with darker
       run: |
         darker -r 60625f241f298b5039cb2debc365db38aa7bb522 --check --diff . || (

.github/workflows/test.yml

@@ -60,9 +60,9 b' jobs:'
       run: echo "disable latex for now, issues in mirros" #sudo apt-get -yq -o Acquire::Retries=3 --no-install-suggests --no-install-recommends install texlive dvipng
     - name: Install and update Python dependencies
       run: |
-        python -m pip install --upgrade pip setuptools wheel build
-        python -m pip install --upgrade -e .[${{ matrix.deps }}]
-        python -m pip install --upgrade check-manifest pytest-cov  pytest-json-report
+        python -m pip install --only-binary ':all:' --upgrade pip setuptools wheel build
+        python -m pip install --only-binary ':all:' --no-binary curio --upgrade -e .[${{ matrix.deps }}]
+        python -m pip install --only-binary ':all:' --upgrade check-manifest pytest-cov  pytest-json-report
     - name: Try building with Python build
       if: runner.os != 'Windows'  # setup.py does not support sdist on Windows
       run: |