Bug 1525923 - Fix version ranges for Dependabot ignored_updates (#4582)
Bug 1525923 - Fix version ranges for Dependabot ignored_updates (#4582)

Since it turns out the `ignored_updates` setting refers to the versions
that should be ignored, rather than the versions that are safe (which is
the opposite of pyup).
KWierso/treeherder,edmorley/treeherder,edmorley/treeherder,KWierso/treeherder,edmorley/treeherder,KWierso/treeherder,KWierso/treeherder,edmorley/treeherder