chore: lower pinned requirements for backend server (#2651)

* chore: lower pinned requirements for backend server

* update one requirement

server/requirements.txt

@@ -1,22 +1,22 @@
-anndata==0.10.3
-boto3==1.29.5
-click==8.1.7
-Flask==3.0.0
-Flask-Compress==1.14
-Flask-Cors==4.0.0
-Flask-RESTful==0.3.10
-flask-server-timing==0.1.2
-flask-talisman==1.1.0
-flatbuffers==1.12
-flatten-dict==0.4.2
-fsspec==2023.10.0
-gunicorn==21.2.0
-h5py==3.10.0
-numba==0.58.1
-numpy==1.26.2
-packaging==23.2
+anndata>=0.8.0
+boto3>=1.12.18
+click>=7.1.2
+Flask>=3.0.0
+Flask-Compress>=1.4.0
+Flask-Cors>=3.0.9
+Flask-RESTful>=0.3.6
+flask-server-timing>=0.1.2
+flask-talisman>=0.7.0
+flatbuffers>=1.11.0,<2.0.0 # cellxgene is not compatible with 2.0.0. Requires migration
+flatten-dict>=0.2.0
+fsspec>0.8.0
+gunicorn>=20.0.4
+h5py>=3.0.0
+numba>=0.51.2
+numpy>1.22
+packaging>=20.0
 pandas<2.0.0
-PyYAML==6.0.1
-requests==2.31.0
+PyYAML>=5.4  # CVE-2020-14343
+requests>=2.22.0
 s3fs==0.4.2
-scipy==1.11.4
+scipy>=1.4