Pin CoreMLTools 7.2 (#3170)

Summary:
It is more stable to pin a release branch of CoreMLTools. We will periodically update it when necessary

Pull Request resolved: #3170

Reviewed By: cccclai

Differential Revision: D56373108

Pulled By: shoumikhin

fbshipit-source-id: d6a96813f07df97abbf8f4ca75e2aae2666372b1
(cherry picked from commit cb77763)

Author: yifan_shen3

backends/apple/coreml/scripts/install_requirements.sh

@@ -24,7 +24,7 @@ rm -rf "$COREML_DIR_PATH/third-party"
 mkdir "$COREML_DIR_PATH/third-party"
 
 echo "${green}ExecuTorch: Cloning coremltools."
-git clone "https://github.com/apple/coremltools.git" $COREMLTOOLS_DIR_PATH
+git clone --depth 1 --branch 7.2 "https://github.com/apple/coremltools.git" $COREMLTOOLS_DIR_PATH
 cd $COREMLTOOLS_DIR_PATH
 
 STATUS=$?