Grab haskell/lsp#376

Grab and test haskell/lsp#376 as we want to include this bug fix for #2479

Author: pepeiborra

cabal.project

@@ -42,7 +42,7 @@ source-repository-package
 source-repository-package
     type: git
     location: https://github.com/haskell/lsp
-    tag: 41b8f01ce284eced717636a796153402ea7cfc5b
+    tag: c90ba254c42d3046b7a2e53b04e06954621e2713
     subdir: lsp-test
 
 -- Standard location for temporary packages needed for particular environments