Revert "github: setup zig always"

This reverts commit fb364cd.

Author: penberg

.github/workflows/CI.yml

@@ -80,6 +80,7 @@ jobs:
             target/
           key: ${{ matrix.settings.target }}-cargo-${{ matrix.settings.host }}
       - uses: goto-bus-stop/setup-zig@v2
+        if: ${{ matrix.settings.target == 'armv7-unknown-linux-gnueabihf' || matrix.settings.target == 'armv7-unknown-linux-musleabihf' }}
         with:
           version: 0.13.0
       - name: Setup toolchain