bundled pjproject: Fix DNS write to freed memory.

PJPROJECT 2.5.5 introduced a race condition with the -r5349 IPv6 DNS
patch.

The patch below fixes a write to freed memory under cartain DNS lookup
conditions.

0006-r5477-svn-backport-Fix-DNS-write-on-freed-memory.patch

ASTERISK-26516
Reported by:  Richard Mudgett

Change-Id: Ifdfae9ecf1e41b53080f33aab44ce1a220f349c5