Fix test failure on HPPA
https://bugs.gentoo.org/920696
https://debbugs.gnu.org/73036

--- emacs-29.4/test/lisp/erc/erc-networks-tests.el
+++ emacs-29.4/test/lisp/erc/erc-networks-tests.el
@@ -136,10 +136,12 @@
     (with-temp-buffer
       (setq erc-networks--id (erc-networks--id-fixed-create 'oldest)
             oldest (current-buffer))
+      (sleep-for 0.02)
 
       (with-temp-buffer
         (setq erc-networks--id (erc-networks--id-fixed-create 'middle)
               middle (current-buffer))
+        (sleep-for 0.02)
 
         (with-temp-buffer
           (setq erc-networks--id (erc-networks--id-fixed-create 'newest)