CI: Build on Python 3.12, drop 3.7 [build wheels]

Author: effigies

.github/workflows/wheels.yml

@@ -61,7 +61,7 @@ jobs:
           - [ubuntu-20.04, musllinux_x86_64]
           - [macos-12, macosx_*]
           - [windows-2019, win_amd64]
-        python: ["cp37", "cp38", "cp39", "cp310", "cp311"]
+        python: ["cp38", "cp39", "cp310", "cp311", "cp312"]
         include:
           # Manylinux builds are cheap, do all in one
           - { buildplat: ["ubuntu-20.04", "manylinux_x86_64"], python: "*" }