Pin moto dependency due to breaking changes (#1365)

tox.ini

@@ -13,15 +13,15 @@ setenv =
 	DJANGO_SETTINGS_MODULE = tests.settings
 	PYTHONWARNINGS = always
 	PYTHONDONTWRITEBYTECODE = 1
-commands = pytest --cov=storages tests/ {posargs}
+commands = pytest --cov=storages {posargs}
 deps =
 	cryptography
 	django3.2: django~=3.2.9
 	django4.1: django~=4.1.0
 	django4.2: django~=4.2.0
 	django5.0: django~=5.0b1
 	djangomain: https://github.com/django/django/archive/main.tar.gz
-	moto
+	moto<5
 	pytest
 	pytest-cov
 	rsa
@@ -41,3 +41,9 @@ commands =
 	ruff .
 	black --check .
 skip_install = true
+
+
+[pytest]
+# Default test paths to run, if no other paths are specified on the CLI
+# (specify paths after a -- e.g. `tox -- tests/test_s3.py`)
+testpaths = tests/