Add Ruby 2.6.5, 2.5.7, 2.4.9
Add Ruby 2.6.5, 2.5.7, 2.4.9

2.4.8 was skipped due to some packaging issue

CVE-2019-16201: Regular Expression Denial of Service vulnerability of WEBrick's Digest access authentication
2019-10-01
CVE-2019-15845: A NUL injection vulnerability of File.fnmatch and File.fnmatch?
2019-10-01
CVE-2019-16254: HTTP response splitting in WEBrick (Additional fix)
2019-10-01
CVE-2019-16255: A code injection vulnerability of Shell#[] and Shell#test
2019-10-01

Signed-off-by: Tim Smith <764ef62106582a09ed09dfa0b6bff7c05fd7d1e4@chef.io>

aerobase/omnibus-software,mattray/omnibus-software,mattray/omnibus-software,chef/omnibus-software,higanworks/omnibus-software,higanworks/omnibus-software,chef/omnibus-software,aerobase/omnibus-software,aerobase/omnibus-software,mattray/omnibus-software,aerobase/omnibus-software,chef/omnibus-software,chef/omnibus-software,higanworks/omnibus-software,mattray/omnibus-software,chef/omnibus-software,higanworks/omnibus-software,chef/omnibus-software,mattray/omnibus-software,aerobase/omnibus-software