fix: downgrade libxmljs to 0.10.7

[pmstss]

relates-to #341

[pmstss]

for libxmljs v0.19.10 precompiled binaries for currently used node v14 (ABI v83) are available, but cause a silent exit with status 0 for nodejs process on attempt to parse XML (e.g. on POST /api/metadata route).
for libxmljs v0.19.7 ABI v83 binaries are not available, and thus they are built from scratch - and this way they do not cause an issues during XML parsing
drawback of this is that pretty heavy python3 py3-pip make g++ are still required in docker