Update CI for aarch64 mac build

.github/workflows/depends.yml

@@ -46,10 +46,12 @@ jobs:
           - name: "x86_64 Linux"
             host: "x86_64-unknown-linux-gnu"
             packages: "gperf cmake python3-zmq libdbus-1-dev libharfbuzz-dev"
-          - name: "Cross-Mac"
+          - name: "Cross-Mac x86_64"
             host: "x86_64-apple-darwin11"
             packages: "cmake imagemagick libcap-dev librsvg2-bin libz-dev libbz2-dev libtiff-tools python-dev python3-setuptools-git"
-            osx_sdk: "10.11"
+          - name: "Cross-Mac aarch64"
+            host: "aarch64-apple-darwin11"
+            packages: "cmake imagemagick libcap-dev librsvg2-bin libz-dev libbz2-dev libtiff-tools python-dev python3-setuptools-git"
           - name: "x86_64 Freebsd"
             host: "x86_64-unknown-freebsd"
             packages: "clang-8 gperf cmake python3-zmq libdbus-1-dev libharfbuzz-dev"
@@ -85,12 +87,6 @@ jobs:
       run: ${{env.APT_SET_CONF}}
     - name: install dependencies
       run: sudo apt update; sudo apt -y install build-essential libtool cmake autotools-dev automake pkg-config bsdmainutils curl git ca-certificates ccache ${{ matrix.toolchain.packages }}
-    - name: prepare apple-darwin11
-      if: ${{ matrix.toolchain.host == 'x86_64-apple-darwin11' }}
-      run: |
-        mkdir -p contrib/depends/SDKs contrib/depends/sdk-sources
-        if [ ! -f contrib/depends/sdk-sources/MacOSX${{ matrix.toolchain.osx_sdk }}.sdk.tar.gz ]; then curl --location --fail https://bitcoincore.org/depends-sources/sdks/MacOSX${{ matrix.toolchain.osx_sdk }}.sdk.tar.gz -o contrib/depends/sdk-sources/MacOSX${{ matrix.toolchain.osx_sdk }}.sdk.tar.gz; fi
-        if [ -f contrib/depends/sdk-sources/MacOSX${{ matrix.toolchain.osx_sdk }}.sdk.tar.gz ]; then tar -C contrib/depends/SDKs -xf contrib/depends/sdk-sources/MacOSX${{ matrix.toolchain.osx_sdk }}.sdk.tar.gz; fi
     - name: prepare w64-mingw32
       if: ${{ matrix.toolchain.host == 'x86_64-w64-mingw32' || matrix.toolchain.host == 'i686-w64-mingw32' }}
       run: |