I think we can get away with this

.github/workflows/ci.yaml

@@ -41,7 +41,7 @@ jobs:
       run: |
         # Get a Python 2 compatible version of setuptools_scm so that pip
         # doesn't install a Python 2 incompatible version for cbor2.
-        pip install setuptools_scm==1.17.0
+        pip install setuptools_scm<6
         python -m pip install -v ./[test]
 
     - name: "Dump Python Environment"