pyproject.toml: Update dev-dependency syntax and build system (#249)

* pyproject.toml: Update dev dependency syntax

* pyproject.toml: Update build-system

* chore: Update poetry.lock

Author: bkeryan

poetry.lock

@@ -49,7 +49,7 @@ pep8-naming = ">=0.11.1"
 
 
 
-[tool.poetry.dev-dependencies]
+[tool.poetry.group.dev.dependencies]
 pytest = ">=6.0.1"
 pytest_click = ">=1.0.2"
 pytest-snapshot = ">=0.6.3"
@@ -73,6 +73,6 @@ extend_exclude = "*__snapshots/*/*input.py,tests/*/input/*.py"
 
 
 [build-system]
-requires = ["poetry>=0.12"]
-build-backend = "poetry.masonry.api"
+requires = ["poetry-core>=1.0,<3.0"]
+build-backend = "poetry.core.masonry.api"