fix: requirements.txt to reduce vulnerabilities

The following vulnerabilities are fixed by pinning transitive dependencies:
- https://snyk.io/vuln/SNYK-PYTHON-FONTTOOLS-6133203
- https://snyk.io/vuln/SNYK-PYTHON-GEVENT-5906371
- https://snyk.io/vuln/SNYK-PYTHON-NUMPY-2321964
- https://snyk.io/vuln/SNYK-PYTHON-NUMPY-2321966
- https://snyk.io/vuln/SNYK-PYTHON-NUMPY-2321970
- https://snyk.io/vuln/SNYK-PYTHON-PILLOW-5918878
- https://snyk.io/vuln/SNYK-PYTHON-PILLOW-6043904
- https://snyk.io/vuln/SNYK-PYTHON-PILLOW-6182918
- https://snyk.io/vuln/SNYK-PYTHON-PILLOW-6219984
- https://snyk.io/vuln/SNYK-PYTHON-PILLOW-6219986
- https://snyk.io/vuln/SNYK-PYTHON-PYARROW-6052811
- https://snyk.io/vuln/SNYK-PYTHON-PYDANTIC-5907722
- https://snyk.io/vuln/SNYK-PYTHON-PYDANTIC-5926694
- https://snyk.io/vuln/SNYK-PYTHON-REDIS-5291195
- https://snyk.io/vuln/SNYK-PYTHON-REDIS-5291196
- https://snyk.io/vuln/SNYK-PYTHON-REQUESTS-5595532
- https://snyk.io/vuln/SNYK-PYTHON-SETUPTOOLS-3180412
- https://snyk.io/vuln/SNYK-PYTHON-SYFT-6097143

requirements.txt

@@ -2,3 +2,13 @@ sycret
 syft @ git+https://github.com/OpenMined/PySyft@sympc-dev#egg=syft&subdirectory=packages/syft
 torch>=1.6,<=1.8.1
 torchcsprng<=0.2.1
+fonttools>=4.43.0 # not directly required, pinned by Snyk to avoid a vulnerability
+gevent>=23.9.0 # not directly required, pinned by Snyk to avoid a vulnerability
+numpy>=1.22.2 # not directly required, pinned by Snyk to avoid a vulnerability
+pillow>=10.2.0 # not directly required, pinned by Snyk to avoid a vulnerability
+pyarrow>=14.0.1 # not directly required, pinned by Snyk to avoid a vulnerability
+pydantic>=1.10.13 # not directly required, pinned by Snyk to avoid a vulnerability
+redis>=4.4.4 # not directly required, pinned by Snyk to avoid a vulnerability
+requests>=2.31.0 # not directly required, pinned by Snyk to avoid a vulnerability
+setuptools>=65.5.1 # not directly required, pinned by Snyk to avoid a vulnerability
+syft>=0.8.2b19 # not directly required, pinned by Snyk to avoid a vulnerability