Set custom :version for recently modified undo options

* lisp/cus-start.el (undo-limit, undo-strong-limit, undo-outer-limit):
Bump :version.
1 job for master in 52 minutes and 24 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
failed #2952
test-all

00:52:24

 
Name Stage Failure
failed
test-all Test
Makefile:318: recipe for target 'check-doit' failed
make[2]: *** [check-doit] Error 1
make[2]: Leaving directory '/builds/emacs/emacs/test'
Makefile:293: recipe for target 'check-expensive' failed
make[1]: *** [check-expensive] Error 2
make[1]: Leaving directory '/builds/emacs/emacs/test'
Makefile:959: recipe for target 'check-expensive' failed
make: *** [check-expensive] Error 2
ERROR: Job failed: exit code 1