Update to use new poetry 1.2+ command syntax

Makefile

@@ -33,7 +33,7 @@ test: ## Run the project testsuite(s)
 	poetry run tox --recreate
 
 dev: ## Create the local dev environment
-	poetry install -E poetry --sync
+	poetry install --extras poetry --sync
 	poetry run pre-commit install
 
 publish: test wheel source ## Build and upload to pypi (requires $PYPI_API_KEY be set)

tox.ini

@@ -83,7 +83,8 @@ commands =
       --format requirements.txt \
       --output {envtmpdir}/requirements.txt \
       --without-hashes \
-      --dev
+      --with dev \
+      --extras poetry
     safety check \
       --file {envtmpdir}/requirements.txt \
       --json