Upgrade the coremltools version. (#5425)

Summary:
Pull Request resolved: #5425

.

Reviewed By: digantdesai

Differential Revision: D62879846

fbshipit-source-id: 3cbb9753dc078ecc0c04b03650b0505b3e4f3908

Author: shoumikhin

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 --depth 1 --branch 8.0b2 "https://github.com/apple/coremltools.git" $COREMLTOOLS_DIR_PATH
+git clone --depth 1 --branch 8.0 "https://github.com/apple/coremltools.git" $COREMLTOOLS_DIR_PATH
 cd $COREMLTOOLS_DIR_PATH
 
 STATUS=$?