fix(lsp): reset document color processed version on clear (#38582)

(cherry picked from commit 92a667c07f)

runtime/lua/vim/lsp/document_color.lua

@@ -236,6 +236,7 @@ end
 function Provider:clear()
   for _, state in pairs(self.client_state) do
     state.hl_info = {}
+    state.processed_version = nil
     state.applied_version = nil
     api.nvim_buf_clear_namespace(self.bufnr, state.namespace, 0, -1)
   end