Remove unused packages

[gunesacar]

The following three lines can be removed.

https://github.com/microsoft/OmniParser/blob/a14c4010ebd91aae83a240badadc9e5721aaf0c8/utils.py#L11 https://github.com/microsoft/OmniParser/blob/a14c4010ebd91aae83a240badadc9e5721aaf0c8/requirements.txt#L5 https://github.com/microsoft/OmniParser/blob/a14c4010ebd91aae83a240badadc9e5721aaf0c8/requirements.txt#L8

azure-identity and openai are listed in requirements.txt, but they are not actually used in the code. AzureOpenAI is imported from openai, but it's never used.