Bump lsp versions

Author: fendor

plugins/hls-cabal-plugin/hls-cabal-plugin.cabal

@@ -38,8 +38,8 @@ library
     , ghcide                ^>= 1.8
     , hashable
     , hls-plugin-api        ^>=1.5
-    , lsp                   ^>=1.4.0.0
-    , lsp-types             ^>=1.4.0.1
+    , lsp                   ^>=1.6.0.0
+    , lsp-types             ^>=1.6.0.0
     , regex-tdfa            ^>=1.3.1
     , stm
     , text                  ^>=1.2.4.0