Stop using Conan on MacOS

Author: jim-easterbrook

.github/workflows/build-macos-arm.yml

@@ -27,10 +27,7 @@ jobs:
           CIBW_SKIP: pp3*
           CIBW_BEFORE_ALL: >
             brew install ninja &&
-            pip3 install conan==1.59.0 "cython<3.0" &&
             cd exiv2-0.27.7-Source/build &&
-            conan profile new --detect default &&
-            conan install .. -o unitTests=False -b missing -pr:b=default -s arch=armv8 &&
             cmake .. -DCMAKE_BUILD_TYPE=Release \
               -DCMAKE_INSTALL_PREFIX=${{ env.EXIV2_ROOT }} \
               -DCMAKE_CXX_FLAGS="-Wno-deprecated-declarations" \