Update pyproject.toml (#21)

Author: haochengxia

pyproject.toml

@@ -80,7 +80,7 @@ build = ["cp39-*", "cp310-*", "cp311-*", "cp312-*", "cp313-*"]
 skip = ["*-win32", "*-manylinux_i686", "*-musllinux*", "pp*"]
 
 # Set the environment variable for the wheel build step.
-environment = { LCS_BUILD_DIR = "{project}/src/libCacheSim/build", MACOSX_DEPLOYMENT_TARGET = "15.0" }
+environment = { LCS_BUILD_DIR = "{project}/src/libCacheSim/build", MACOSX_DEPLOYMENT_TARGET = "14.0" }
 
 # Test that the wheel can be imported
 test-command = "python -c 'import libcachesim; print(\"Import successful\")'"