contrib: update yaml-cpp hash with new value

Github re-generated the archive with slight differences which gives a
different hash. No file was modified inside the archive between the
old and new version.

Change-Id: I8722a620548e7b5abb301bf68bd4187ff971a831
Reviewed-by: Olivier Soldano <olivier.soldano@savoirfairelinux.com>

contrib/src/yaml-cpp/SHA512SUMS

-0347377adf60b28cf542fef6a6f24585d93ebab28f413b7ed0ac395093ca09c1ba55f7a9b172ae24214ff72128b40d0a3a821ec5015fb30a8b49d992d794c3e7  yaml-cpp-24fa1b33805c9a91df0f32c46c28e314dd7ad96f.tar.gz
+63f70fdc4cb23c90a9c671dadc57093250c351828b7f9ad70a1c8389ea5aefc6bcf30b186a62f3319ae011d0a0a091abced130e6754a244418d52c3e74b0e2c1  yaml-cpp-24fa1b33805c9a91df0f32c46c28e314dd7ad96f.tar.gz