fix: replace deprecated str downcase/upcase with str lowercase/uppercase

nushell/modules/pj_zoxide.nu

@@ -42,7 +42,7 @@ export-env {
 #
 
 def _pj_normalize_windows_drive [path: string] {
-  if (($nu.os-info.name | str downcase) != "windows") {
+  if (($nu.os-info.name | str lowercase) != "windows") {
     return $path
   }
 
@@ -52,7 +52,7 @@ def _pj_normalize_windows_drive [path: string] {
   }
 
   let item = ($parsed | first)
-  $"(($item.drive | str upcase)):($item.rest)"
+  $"(($item.drive | str uppercase)):($item.rest)"
 }
 
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