Update fixtures.py

Minor upgrade of ruff breaks without this fix

src/speckle_automate/fixtures.py

@@ -22,10 +22,10 @@ class TestAutomationEnvironment(BaseSettings):
         extra="ignore",
     )
 
-    token: str = Field()
-    server_url: str = Field()
-    project_id: str = Field()
-    automation_id: str = Field()
+    token: str = Field(default="")
+    server_url: str = Field(default="")
+    project_id: str = Field(default="")
+    automation_id: str = Field(default="")
 
 
 @pytest.fixture()

src/specklepy/transports/server/server.py

@@ -86,12 +86,6 @@ class ServerTransport(AbstractTransport):
 
         self.session = requests.Session()
 
-        self.session.headers.update(
-            {
-                "Accept": "text/plain",
-            }
-        )
-
         if self.account is not None:
             self._batch_sender = BatchSender(
                 self.url, self.stream_id, self.account.token, max_batch_size_mb=1
@@ -99,6 +93,7 @@ class ServerTransport(AbstractTransport):
             self.session.headers.update(
                 {
                     "Authorization": f"Bearer {self.account.token}",
+                    "Accept": "text/plain",
                 }
             )