build[dace][next]: Changed DaCe Source (#2012)

Instead of pulling directly from the official DaCe repo, we now (for the
time being) pull from [this
PR](GridTools/dace#1).
This became necessary as we have a lot of open PR in DaCe and need some
custom fixes (that can in their current form not be merged into DaCe).
In the long term however, we should switch back to the main DaCe repo.

Author: philip-paul-mueller

pyproject.toml

@@ -434,7 +434,7 @@ url = 'https://test.pypi.org/simple/'
 
 [tool.uv.sources]
 atlas4py = {index = "test.pypi"}
-dace = {git = "https://github.com/spcl/dace", branch = "main", extra = "dace-next"}
+dace = {git = "https://github.com/GridTools/dace", branch = "gt4py-next-integration", extra = "dace-next"}
 
 # -- versioningit --
 [tool.versioningit]