Fix failing CI builds (#7)

.github/workflows/wheels.yml

@@ -1,14 +1,18 @@
 name: Build
 
-on: [push, pull_request]
+on:
+  push:
+    branches:
+      - master
+  pull_request:
 
 jobs:
   build_wheels:
     name: Build wheels on ${{ matrix.os }}
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [ubuntu-latest, windows-latest, macos-12, macos-13, macos-14]
+        os: [ubuntu-latest, windows-latest, macos-13, macos-14, macos-latest]
 
     steps:
       - uses: actions/checkout@v4
@@ -22,9 +26,9 @@ jobs:
           platforms: all
 
       - name: Build wheels
-        uses: pypa/cibuildwheel@v2.16.5
+        uses: pypa/cibuildwheel@v2.21.1
         env:
-          CIBW_ARCHS_LINUX: auto aarch64 ppc64le s390x
+          CIBW_ARCHS_LINUX: auto
           CIBW_ARCHS_WINDOWS: all
 
       - uses: actions/upload-artifact@v4

pyproject.toml

@@ -10,7 +10,7 @@ author = "The tksvg authors"
 url = "https://github.com/TkinterEP/tksvg"
 
 [tool.cibuildwheel]
-skip = ["cp36-*", "cp37-*"]
+skip = ["cp36-*", "cp37-*", "cp38-*", "pp*"]
 
 [tool.cibuildwheel.linux]
 before-all = "yum install -y tcl-devel tk-devel"