Update install_requirements script to use https (#936)

Summary:
Updated install_requirements script to use https.

Pull Request resolved: #936

Reviewed By: mergennachin

Differential Revision: D50312497

Pulled By: kimishpatel

fbshipit-source-id: 60f6e8f82460c3e5518b455b42d502b037b8569c

Author: cymbalrush

backends/apple/coreml/scripts/install_requirements.sh

@@ -22,7 +22,7 @@ if [ -d "/tmp/coremltools" ]; then
 fi
 
 echo "${green}ExecuTorch: Cloning coremltools."
-git clone git@github.com:apple/coremltools.git /tmp/coremltools
+git clone "https://github.com/apple/coremltools.git" /tmp/coremltools
 cd /tmp/coremltools
 STATUS=$?
 if [ $STATUS -ne 0 ]; then