fix tox when installs requirements for celery

requirements.txt

-orchestrator-core[celery]==1.3.4
+orchestrator-core==1.3.4
 requests==2.31.0
 infoblox-client~=0.6.0
 pycountry==22.3.5
 pynetbox==7.2.0
 celery-redbeat==2.1.1
+celery==5.3.4
 
 # Test and linting dependencies
 pytest==7.4.3

setup.py

@@ -9,12 +9,13 @@ setup(
     url="https://gitlab.software.geant.org/goat/gap/geant-service-orchestrator",
     packages=find_packages(),
     install_requires=[
-        "orchestrator-core[celery]==1.3.4",
+        "orchestrator-core==1.3.4",
         "requests==2.31.0",
         "infoblox-client~=0.6.0",
         "pycountry==22.3.5",
         "pynetbox==7.2.0",
         "celery-redbeat==2.1.1",
+        "celery==5.3.4",
     ],
     include_package_data=True,
 )