updated Rustaceanvim; configured it to search all symbols

nvim/.config/nvim/lua/configs/rustacean.lua

···
+vim.g.rustaceanvim = {
+  server = {
+    default_settings = {
+      ['rust-analyzer'] = {
+        workspace = {
+          symbol = {
+            search = {
+              kind = 'all_symbols'
+            }
+          }
+        }
+      }
+    }
+  }
+}

nvim/.config/nvim/lua/plugins/rust.lua

···
 return {
   {
     "mrcjkb/rustaceanvim",
-    version = "^5", -- Recommended
+    version = "^6", -- Recommended
     lazy = false, -- This plugin is already lazy
+    config = function ()
+      require "configs.rustacean"
+    end
   },
 
   {
···
     ft = { "slint" },
   },
 }
+