Security::PipelineVulnerabilitiesFinder sort is
now stable contrary to the bare Ruby sort_by
method. Using just sort_by leads to instability
across different platforms (e.g., x86_64-linux and
x86_64-darwin18) which in turn leads to different
sorting results for the equal elements across
these platforms. This is important because it
breaks test suite results consistency between
local and CI environment.