gnu: poppler-next: Don't use 'package/inherit'.

* gnu/packages/pdf.scm (poppler-next): Use object inheritance instead of
PACKAGE/INHERIT because it is a different version, so replacement of the
original should not be inherited.

gnu/packages/pdf.scm

@@ -315,7 +315,8 @@ When present, Poppler is able to correctly render CJK and Cyrillic text.")
 ;; XXX: Remove it on core-updates.  It is only needed for evince 42.3 that
 ;; requires a recent poppler.
 (define-public poppler-next
-  (package/inherit poppler
+  (package
+    (inherit poppler)
     (name "poppler-next")
     (version "22.09.0")
     (source (origin