This updates `go.mozilla.org/sops/v3` to the `v3.8.0-rc.1` release of
`github.com/getsops/sops/v3`.
This (finally) allows us to drop our forked key sources, as they have
now been contributed upstream in a slightly modified form which still
allows us to maintain control over the used credentials in isolation.
Signed-off-by: Hidde Beydals <hidde@hhh.computer>
Hidde Beydals
Stefan Prodan