Bug#961037: update to v1.0.0-rc.2

[Sylwester Arabas]

Package: gnudatalanguage
Version: 1.0.0~rc.1

There's a new version v1.0.0-rc.2 released on March 5 available:
https://github.com/gnudatalanguage/gdl/releases/tag/v1.0.0-rc.2

Thanks,
Sylwester