Replace tabs by spaces for consistency

tests/data/src/pep518_with_extra_and_markers-1.0/pyproject.toml

@@ -1,7 +1,8 @@
 [build-system]
-requires=[
-	"requires_simple_extra[extra]",
-	"simplewheel==1.0; python_version < '3'",
-	"simplewheel==2.0; python_version >= '3'",
-	"setuptools", "wheel",
+requires = [
+    "requires_simple_extra[extra]",
+    "simplewheel==1.0; python_version < '3'",
+    "simplewheel==2.0; python_version >= '3'",
+    "setuptools",
+    "wheel",
 ]

tox.ini

@@ -25,8 +25,8 @@ setenv =
     LC_CTYPE = en_US.UTF-8
 deps = -r{toxinidir}/tools/requirements/tests.txt
 commands_pre =
-	python -c 'import shutil, sys; shutil.rmtree(sys.argv[1], ignore_errors=True)' {toxinidir}/tests/data/common_wheels
-	{[helpers]pip} wheel -w {toxinidir}/tests/data/common_wheels -r {toxinidir}/tools/requirements/tests-common_wheels.txt
+    python -c 'import shutil, sys; shutil.rmtree(sys.argv[1], ignore_errors=True)' {toxinidir}/tests/data/common_wheels
+    {[helpers]pip} wheel -w {toxinidir}/tests/data/common_wheels -r {toxinidir}/tools/requirements/tests-common_wheels.txt
 commands = pytest --timeout 300 []
 install_command = {[helpers]pip} install {opts} {packages}
 list_dependencies_command = {[helpers]pip} freeze --all