[Snyk] Fix for 21 vulnerabilities

[MAJID-NISAR]

Snyk has created this PR to fix 21 vulnerabilities in the pip dependencies of this project.

Snyk changed the following file(s):

• backend/requirements.txt

⚠️ Warning

uvicorn 0.22.0 requires h11, which is not installed.
rapidocr-onnxruntime 1.2.3 requires Pillow, which is not installed.
python-pptx 0.6.23 requires Pillow, which is not installed.
python-jose 3.4.0 has requirement pyasn1<0.5.0,>=0.4.1, but you have pyasn1 0.5.1.
onnxruntime 1.14.1 has requirement numpy>=1.21.6, but you have numpy 1.21.3.
fpdf2 2.7.8 requires Pillow, which is not installed.
fpdf2 2.7.8 requires fonttools, which is not installed.
fake-useragent 1.5.1 has requirement importlib-metadata~=4.0; python_version < "3.8", but you have importlib-metadata 6.7.0.

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