[go_mockery] Support version 2 and version 3

[jaudiger]

Following comment #531 (comment), we should support both maintained versions of go-mockery. It'll let us package new packages such as terragrunt which relies on go-mockery 2 to be built today.

A good example on how to do it in a straightforward way is to look at the [python](https://github.com/brioche-dev/brioche-packages/blob/c4e1355887f80fdf29796502c5d92f68db7864ea/packages/python/project.bri#L6) package with a few adaptations:

export const project = {
  name: "go_mockery",
  version: "3.2.5",
  extra: {
    currentMajorVersion: "3",
    majorVersions: {
      "3": "3.2.5",
      "2": "2.53.4",
    },
  },
};

Two additional things that will need to be taken into account:

• Update the test method to ensure all the major versions are tested
• Tweak the live-update method to retrieve the latest version of both major releases.