Upgrade Jackson dependency to 2.9.8 because of CVEs in 2.6.5
Upgrade Jackson dependency to 2.9.8 because of CVEs in 2.6.5

Resolves:
https://github.com/joffrey-bion/livedoc/issues/124

joffrey-bion/livedoc,joffrey-bion/livedoc,joffrey-bion/livedoc,joffrey-bion/livedoc,joffrey-bion/livedoc