Update CI job with "oldest supported dependencies"

Alpine 3.17 has faded away, bump to Alpine 3.18.

Author: WhyNotHugo

.builds/tests-minimal.yml

@@ -3,7 +3,7 @@
 # TODO: It might make more sense to test with an older Ubuntu or Fedora version
 # here, and consider that our "oldest suppported environment".
 
-image: alpine/3.17 # python 3.10
+image: alpine/3.18 # python 3.11
 packages:
   - docker
   - docker-cli
@@ -28,6 +28,8 @@ tasks:
       sudo service docker start
   - setup: |
       cd vdirsyncer
+      # Hack, no idea why it's needed
+      sudo ln -s /usr/include/python3.11/cpython/longintrepr.h /usr/include/python3.11/longintrepr.h
       make -e install-dev
   - test: |
       cd vdirsyncer

setup.py

@@ -18,7 +18,7 @@
     "requests >=2.20.0",
     # https://github.com/untitaker/python-atomicwrites/commit/4d12f23227b6a944ab1d99c507a69fdbc7c9ed6d  # noqa
     "atomicwrites>=0.1.7",
-    "aiohttp>=3.8.0,<4.0.0",
+    "aiohttp>=3.8.2,<4.0.0",
     "aiostream>=0.4.3,<0.5.0",
 ]