[CI] Fix packaging errors with Python 3.7

The latest Pillow 10 does not support Py3.7 therefore wheels are no
longer available and we need to specify previous major version.

Older versions of setuptools do not correctly determine the Twisted
requirement for zope.interface>5 on Python 3.7 so ensure latest
installed. For the CD builds we don't want any surprises so keep the
setuptools version pinned.

Refs: https://pillow.readthedocs.io/en/stable/installation.html
Closes: #433

.github/workflows/cd.yml

@@ -49,7 +49,7 @@ jobs:
           cache: pip
 
       - name: Prepare pip
-        run: python -m pip install wheel
+        run: python -m pip install wheel setuptools==68.*
 
       - name: Install GTK
         run: |

.github/workflows/ci.yml

@@ -36,7 +36,7 @@ jobs:
 
       - name: Install dependencies
         run: |
-          pip install --upgrade pip wheel
+          pip install --upgrade pip wheel setuptools
           pip install -r requirements.txt -r requirements-tests.txt
           pip install -e .
 
@@ -91,7 +91,7 @@ jobs:
 
       - name: Install dependencies
         run: |
-          pip install --upgrade pip wheel
+          pip install --upgrade pip wheel setuptools
           pip install -r requirements.txt -r requirements-tests.txt
           pip install -e .
 

requirements.txt

@@ -4,6 +4,7 @@ rencode
 pyopenssl
 pyxdg
 pillow
+pillow<=9; python_version=="3.7"
 mako
 setuptools
 chardet