[FIX] service: do not call nonexistent function

omission in d26e253e

kill -3 (SIGQUIT) is not processed like the other signals so it doesn't
go through this bit of code, but leaving the AttributeError lurking
there is not a good idea.

closes odoo/odoo#37218

X-original-commit: ac65ef02
Signed-off-by: Denis Vermylen <Icallhimtest@users.noreply.github.com>

odoo/service/server.py

@@ -563,7 +563,7 @@ class PreforkServer(CommonServer):
                 raise KeyboardInterrupt
             elif sig == signal.SIGQUIT:
                 # dump stacks on kill -3
-                self.dumpstacks()
+                dumpstacks()
             elif sig == signal.SIGUSR1:
                 # log ormcache stats on kill -SIGUSR1
                 log_ormcache_stats()