Fix (or improve) syntax for installing backports (#1594)

setup.py

@@ -18,7 +18,6 @@
 import platform
 import re
 import subprocess
-import sys
 from io import open
 from os import path
 from pathlib import Path
@@ -66,15 +65,10 @@ def get_long_description():
     "datahugger>=0.2",
     "synergy_dataset",
     "sqlalchemy-utils",
+    "tomli; python_version < '3.11'",
+    "importlib_metadata; python_version < '3.10'",
 ]
 
-if sys.version_info < (3, 11):
-    REQUIRES += ["tomli"]
-
-
-if sys.version_info < (3, 10):
-    REQUIRES += ["importlib_metadata>=3.6"]
-
 
 DEPS = {
     "sbert": ["sentence_transformers"],