TST: Re-introduce python 3.7 to tox

setup.py

@@ -171,7 +171,7 @@ def setup_package():
             "Topic :: Scientific/Engineering :: Information Analysis",
         ],
         packages=find_packages('src'),
-        python_requires='>=3.8',
+        python_requires='>=3.7',
         package_dir={'': 'src'},
         install_requires=['lxml>=4.6.3',
                           "requests[socks]>=2.26",

tox.ini

 [tox]
-envlist=py38, py39, py310, py311
+envlist=py37, py38, py39, py310, py311
 skip_missing_interpreters = true
 
 [testenv]
@@ -7,7 +7,7 @@ deps = .
     nose
     pytest
     pytest-cov
-    jsonschema==4.0.1
+    jsonschema>=4.4.0
 commands=py.test --cov=caosdb -vv {posargs}
 
 [flake8]