overrides were out of order

pyproject.toml

@@ -64,15 +64,16 @@ inherit.environment="append"
 environment = { CPATH="/opt/homebrew/include", LIBRARY_PATH="/opt/homebrew/lib" }
 
 [[tool.cibuildwheel.overrides]]
-select = "*-macosx_arm64"
+select = "*-macosx_x86_64"
 inherit.environment="append"
-environment = { MACOSX_DEPLOYMENT_TARGET="10.15" } # catalina the minimum version of gsl supported by 'brew' 
+environment = { MACOSX_DEPLOYMENT_TARGET="10.15" } # 10.15 is Catalina the minimum version of gsl supported by 'brew' 
 inherit.before-all="append"
+before-all = "brew install gsl"  # since Big Sur x86_64 version exists, it should install that version
 # install the catalina version of `gsl`
 # before-all = "brew fetch --force --bottle-tag=catalina gsl; brew reinstall $(brew --cache --bottle-tag=catalina gsl)"
 
 [[tool.cibuildwheel.overrides]]
-select = "*-macosx_x86_64"
+select = "*-macosx_arm64"
 inherit.before-all="append"
 # need to force the Big Sur (MacOS 11.0) version of `gsl` to match the wheel tag, otherwise it will attempt to install MacOS 14 version
 before-all = "brew fetch --force --bottle-tag=arm64_big_sur gsl; brew reinstall $(brew --cache --bottle-tag=arm64_big_sur gsl)"