contrib: medialibrary: update to 0.12.3

This update contains three minor release at once.

0.12.1:
- Fix network drives listing on Win32
- Fix incorrect benchmarks code, which was not testing the actual
  requests
- Fix build for OpenWrt
- Fix build with upstream llvm/libc++
- Fix logger usages before a logger was set

0.12.2:
- Fix history modification callbacks

0.12.3:
- Remove leftover limitations in the search feature by removing the
  hardcoded limit of 3 characters (which were actually bytes) in the
  pattern
- Fix the search of partial words when searching media in folders

contrib/src/medialibrary/SHA512SUMS

-f5895381135834a04499a3043e2f69b2f56c042e1fae1dd504f7f4ab6f501ee17bc1a9f298183c0b855e5e7373d97912cd5154a0656d9a6d168da16f36ce5ff3  medialibrary-0.12.0.tar.bz2
+aa9e4168cad9cf4b348f834ae85222c65f294f9e8053d7ee138250791857ede356326bda884dc0cfb6a20192d652f73f59996196edd611b33b6638c8f74d101e  medialibrary-0.12.3.tar.bz2

contrib/src/medialibrary/rules.mak

-MEDIALIBRARY_VERSION := 0.12.0
+MEDIALIBRARY_VERSION := 0.12.3
 MEDIALIBRARY_URL := https://code.videolan.org/videolan/medialibrary/-/archive/$(MEDIALIBRARY_VERSION)/medialibrary-$(MEDIALIBRARY_VERSION).tar.bz2
 
 PKGS += medialibrary