Try without xcode-select

Supposedly the XCode version installed in GitHub Actions is 12.4, so
xcode-select actually downgrades us to 12.3, which doesn't seem
necessary.

.github/workflows/rust.yml

@@ -614,13 +614,6 @@ jobs:
         run: sh .github/workflows/install.sh
         env:
           OS_NAME: ${{ matrix.os }}
-          TARGET: ${{ matrix.target }}
-
-      - name: Select XCode to use
-        if: matrix.target == 'aarch64-apple-darwin'
-        run: |
-          sudo xcode-select -s "/Applications/Xcode_12.3.app"
-          sudo rm -Rf /Library/Developer/CommandLineTools/SDKs/*
 
       - name: Build Static Library
         run: sh .github/workflows/build_static.sh