Add execution permissiong to install requirements scripts. (#6082)

Summary:
Pull Request resolved: #6082

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Reviewed By: kirklandsign

Differential Revision: D64149459

fbshipit-source-id: f5ce2c6e110dbf3c748476c7d94bec715f919149
(cherry picked from commit 57e3c81)

Author: shoumikhin

examples/models/flamingo/install_requirements.sh

@@ -8,5 +8,3 @@
 set -x
 
 pip install transformers accelerate sentencepiece tiktoken
-
-pip list