blueprints: open fixtures in read only mode

Signed-off-by: Jens Langhammer <jens.langhammer@beryju.org>

authentik/blueprints/tests/__init__.py

@@ -49,7 +49,7 @@ def reconcile_app(app_name: str):
 
 def load_yaml_fixture(path: str, **kwargs) -> str:
     """Load yaml fixture, optionally formatting it with kwargs"""
-    with open(Path(__file__).resolve().parent / Path(path), "r+", encoding="utf-8") as _fixture:
+    with open(Path(__file__).resolve().parent / Path(path), "r", encoding="utf-8") as _fixture:
         fixture = _fixture.read()
         try:
             return fixture % kwargs