update build.yml

Author: matrix

.github/workflows/build.yml

@@ -231,7 +231,7 @@ jobs:
         run: |
           sudo apt-get update
           sudo apt-get install -y --no-install-recommends \
-               wget ca-certificates zstd tar git make pkg-config llvm cmake g++-mingw-w64-x86-64 gcc-mingw-w64-x86-64 libc++-dev libc++abi-dev lld pkg-config
+               wget ca-certificates zstd tar git make pkg-config llvm cmake g++-mingw-w64-x86-64 gcc-mingw-w64-x86-64 libc++-dev libc++abi-dev lld pkg-config python3
 
           mkdir ~/src && cd ~/src