contrib: bump opendht (UWP)

Fixes account publishing hang.

Change-Id: I35f7fecb8780842fe14fe5385f85548fb831f02b
Reviewed-by: Guillaume Roguez <guillaume.roguez@savoirfairelinux.com>

contrib/src/opendht/fetch_and_patch.bat

 set BUILD=%SRC%..\build
 
-set OPENDHT_VERSION=3fb7c2acfe098b18908d1803e5aaa2437d878af4
+set OPENDHT_VERSION=b08b2f14f20e0dbaa00fc2c70347d578c70e49da
 set OPENDHT_URL=https://github.com/savoirfairelinux/opendht/archive/%OPENDHT_VERSION%.tar.gz
 
 mkdir %BUILD%