Python 3.7 is not supported.

Assignement expression[*] is new in python 3.8
And python 3.7 is already end of life.

Also add testing on 3.12.

[*]https://docs.python.org/3/whatsnew/3.8.html#assignment-expressions

.github/workflows/ci.yaml

@@ -8,7 +8,7 @@ jobs:
     strategy:
       max-parallel: 3
       matrix:
-        python-version: ["3.7", "3.8", "3.9", "3.10", "3.11"]
+        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12"]
 
     steps:
       - name: checkout

requirements.txt

@@ -4,6 +4,7 @@ beautifulsoup4==4.9.3
 zimscraperlib==3.1.1
 Babel==2.12.1
 jinja2==3.1.2
+setuptools==68.2.2
 # to support possible brotli content in warcs
 brotlipy==0.7.0
 cdxj_indexer==1.4.5