chore: fix tox for deptry

Signed-off-by: Jan Kowalleck <[email protected]>

Author: jkowalleck

tox.ini

@@ -34,13 +34,14 @@ setenv =
 [testenv:mypy{,-current,-lowest}]
 skip_install = True
 commands =
-    # mypy config is on own file: `.mypy.ini`
+    # config is on own file: `.mypy.ini`
     !lowest: poetry run mypy
      lowest: poetry run mypy --python-version=3.9
 
 [testenv:flake8]
 skip_install = True
 commands =
+    # config is in own file: `.flake8`
     poetry run flake8 cyclonedx_py/ tests/
 
 [testenv:bandit]
@@ -49,8 +50,8 @@ commands =
     poetry run bandit -c bandit.yml -v -r cyclonedx_py tests
 
 [testenv:deptry]
-# config is in `pyproject.toml`
-command =
+commands =
+    # config is in `pyproject.toml`
     poetry run deptry -v .
 
 [testenv:pyupgrade]