syslogng: fix build by pinning to protobuf_29

https://hydra.nixos.org/build/296045896/nixlog/2/tail

Changed files
+3 -2
pkgs
by-name
sy
syslogng
+3 -2
pkgs/by-name/sy/syslogng/package.nix
···
gperf,
withGrpc ? true,
grpc,
-
protobuf,
+
# see https://github.com/syslog-ng/syslog-ng/pull/5263
+
protobuf_29,
}:
let
python-deps =
···
rdkafka
]
++ (lib.optionals withGrpc [
-
protobuf
+
protobuf_29
grpc
]);