asterisk: bump to 20.5.2

asterisk: bump to 20.5.2

- Resolves GHSA-98rc-4j27-74hh, GHSA-hxj9-xwr8-w8pq, GHSA-5743-x3p5-3rg7
  and GHSA-8857-hfmw-vg8f
- patches refreshed
- patch 180-app_queue_time_t.patch added to fix new warnings, sent
  upstream (see [1])
- 180-res_crypto.c-Avoid-using-the-non-portable-ALLPERMS-m.patch and
  190-chan_iax2.c-Avoid-crash-with-IAX2-switch-support.patch removed as
  they're included in upstream release tar ball.

[1] https://github.com/asterisk/asterisk/pull/516

Signed-off-by: Sebastian Kemper <sebastian_ml@gmx.net>