c-ares: bump to 1.19.1

c-ares: bump to 1.19.1

This is a security and bugfix release.

Security
o CVE-2023-32067. High. 0-byte UDP payload causes Denial of Service
o CVE-2023-31147. Moderate. Insufficient randomness in generation of DNS
query IDs
o CVE-2023-31130. Moderate. Buffer Underwrite in ares_inet_net_pton()
o CVE-2023-31124. Low. AutoTools does not set CARES_RANDOM_FILE during cross
compilation

Fixing libcares.pc
 The pkg-config file libcares.pc in version 1.19.1 has been changed to be unsuitable for OpenWrt
 and causes build errors with Openwrt packages that use libcares.
 For this reason, libcares.pc was replaced.

Signed-off-by: Hirokazu MORIKAWA <morikw2@gmail.com>