[Bug]: Cannot update Sky gateways

[jvstme]

Steps to reproduce

Deploy a new Sky release / restart Sky.

Actual behaviour

The Sky gateway fails to be updated. It is currently stuck at 0.19.37.

Expected behaviour

The Sky gateway is updated.

dstack version

0.20.12

Server logs

{"timestamp": "<redacted>", "logger": "dstack._internal.server.services.gateways", "level": "WARNING", "message": "Failed to update gateway 18.201.247.116: 1 validation error for GatewayComputeConfigurationResponse\n__root__\n  Input must be bytes, bytearray, memoryview, or str: line 1 column 1 (char 0) (type=value_error.jsondecode; msg=Input must be bytes, bytearray, memoryview, or str; doc=; pos=0; lineno=1; colno=1)"}

Additional information

No response