chore: stop updating python 3.6 constraints

All dependencies (except distlib) dropped python 3.6, just stop trying updating.

.github/workflows/update-dependencies.yml

@@ -24,7 +24,7 @@ jobs:
 
     - uses: wntrblm/nox@2023.04.22
       with:
-        python-versions: "3.6, 3.7, 3.8, 3.9, 3.10, 3.11"
+        python-versions: "3.7, 3.8, 3.9, 3.10, 3.11"
 
     - name: "Run update: dependencies"
       run: nox --force-color -s update_constraints

noxfile.py

@@ -9,7 +9,7 @@ import nox
 
 nox.options.sessions = ["lint", "pylint", "check_manifest", "tests"]
 
-PYTHON_ALL_VERSIONS = ["3.6", "3.7", "3.8", "3.9", "3.10", "3.11"]
+PYTHON_ALL_VERSIONS = ["3.7", "3.8", "3.9", "3.10", "3.11"]
 
 DIR = Path(__file__).parent.resolve()