Bump go-yaml version to cover fixed ddos heuristic #362
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This PR bumbs go-yaml to v2.2.4, which has the ddos vulnerability fixed.
Issue:
go-yaml preceding 2.2.4 had vulnerability to ddos attack via billion laughs bomb.
Such attack lead to program to be unresponsive.
Issue has been described in https://raesene.github.io/blog/2019/10/15/From-stackoverflow-to-CVE/