nvim-lspconfig renamed cds-lsp.lua to cds_lsp.lua
Hence, I suggest the mason-registry follows.
Currently none is working:
[mason-lspconfig.nvim] Server "cds-lsp" is not a valid entry in ensure_installed. Make sure to only provide lspconfig server names.
Nor:
[mason-lspconfig.nvim] Server "cds_lsp" is not a valid entry in ensure_installed. Make sure to only provide lspconfig server names.