pyproject.toml: move test req to optional dep

pyproject.toml

@@ -7,10 +7,7 @@ authors = [
 description = 'A library for manipulating eXtra BootConfig (XBC) files'
 readme = 'README.md'
 keywords = ['bootconfig', 'xbc', 'configuration']
-dependencies = [
-	'pyparsing',
-	'pytest'
-]
+dependencies = ['pyparsing']
 requires-python = '>=3.7'
 classifiers = [
 	'Development Status :: 3 - Alpha',
@@ -31,6 +28,9 @@ classifiers = [
 Homepage = 'https://gitea.treehouse.systems/VulpineAmethyst/py-xbc'
 Issues = 'https://gitea.treehouse.systems/VulpineAmethyst/py-xbc/issues'
 
+[project.optional-dependencies]
+test = ['pytest']
+
 [build-system]
 requires = ["setuptools>=61.0"]
 build-backend = "setuptools.build_meta"