fix latest release dates to match security dates

Updated 14.6.1 ReleaseDate from 2024-08-14T00:00:00Z to 2024-08-07T00:00:00Z
Updated 13.6.9 ReleaseDate from 2024-08-14T00:00:00Z to 2024-08-07T00:00:00Z
Updated 12.7.6 ReleaseDate from 2024-08-14T00:00:00Z to 2024-07-29T00:00:00Z

fixes https://github.com/macadmins/sofa/issues/97

tl/dr

during the original loop, gather all the release dates in a dictionary
added a second loop to compare all of the release dates against all of the Latest, compare against ProductVersion - if there is a match, replace it.

macadmins / sofa

fix latest release dates to match security dates #146