ci: add toml

Author: andrewthetechie

.github/workflows/tests.yml

@@ -50,7 +50,7 @@ jobs:
       - name: Install Nox
         run: |
           pipx install --pip-args=--constraint=.github/workflows/constraints.txt nox
-          pipx inject --pip-args=--constraint=.github/workflows/constraints.txt nox nox-poetry
+          pipx inject --pip-args=--constraint=.github/workflows/constraints.txt nox nox-poetry toml
           nox --version
 
       - name: Compute pre-commit cache key