Fix incorrect type in release notes server api. - #7997

main.dart.js:52160 [zoneGuarded]: TypeError: "2.36.0": type 'String' is not a subtype of type 'bool'
main.dart.js:3555 Uncaught 
    at Object.i (http://127.0.0.1:9100/main.dart.js:3555:19)
    at Object.dW (http://127.0.0.1:9100/main.dart.js:4375:9)
    at http://127.0.0.1:9100/main.dart.js:21703:27
    at bS4.a (http://127.0.0.1:9100/main.dart.js:5004:63)
    at bS4.$2 (http://127.0.0.1:9100/main.dart.js:62979:14)
    at bPM.$1 (http://127.0.0.1:9100/main.dart.js:62973:21)
    at Object.bRI (http://127.0.0.1:9100/main.dart.js:5300:19)
    at apm.<anonymous> (http://127.0.0.1:9100/main.dart.js:183085:10)
    at a31.uq (http://127.0.0.1:9100/main.dart.js:64214:12)
    at bBs.$0 (http://127.0.0.1:9100/main.dart.js:63540:11)