Adjust tox passenv to be multiline (#345)

* passenv spacing changes post tox release of 4.0

* formatting

(cherry picked from commit 65e0a80)

tox.ini

@@ -5,7 +5,9 @@ envlist = py37,py38,py39,py310
 [testenv:{unit,py37,py38,py39,py310,py}]
 description = unit testing
 skip_install = true
-passenv = DBT_* PYTEST_ADDOPTS
+passenv =
+    DBT_*
+    PYTEST_ADDOPTS
 commands = {envpython} -m pytest {posargs} tests/unit
 deps =
   -rdev-requirements.txt
@@ -14,7 +16,10 @@ deps =
 [testenv:{integration,py37,py38,py39,py310,py}-{snowflake}]
 description = adapter plugin integration testing
 skip_install = true
-passenv = DBT_* SNOWFLAKE_TEST_* PYTEST_ADDOPTS
+passenv =
+    DBT_*
+    SNOWFLAKE_TEST_*
+    PYTEST_ADDOPTS
 commands =
   snowflake: {envpython} -m pytest {posargs} -m profile_snowflake tests/integration
   snowflake: {envpython} -m pytest {posargs} tests/functional