Skip pypy builds

Author: aMarcireau

.github/workflows/build_wheels.yml

@@ -11,7 +11,7 @@ env:
     CIBW_ARCHS_MACOS: x86_64 arm64
     CIBW_BEFORE_ALL_LINUX: curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- --default-toolchain=stable --profile=minimal -y
     CIBW_ENVIRONMENT_LINUX: 'PATH="$HOME/.cargo/bin:$PATH"'
-    CIBW_SKIP: cp36-*
+    CIBW_SKIP: cp36-* pp*
 
 jobs:
     build_wheels: