Prepare release v0.12.0 (#74)

Also fix the driver gemspecs so they reference the same version as the
current release rather than a hard-coded v0.11.0.

Prepare release v0.11.0 (#68)

Prepare release v0.10.1 (#61)

Prepare a release for v0.10.1, containing only the (quite important) fix
in #60.

Prepare release v0.10.0 (#59)

Mostly contains #53 that upgrades to Ruby 4.0. I wanted to get this out
sooner rather than later because it may be ages until we put another
Ruby change through that'll merit a release.

Prepare release v0.9.1 (#52)

Prepare release v0.9.1, a very minor one including #50 and #51, but also
to keep the gem's latest release somewhat fresh. No functional changes.

Prepare release 0.9.0 (#45)

I just noticed that we've had an unreleased change sitting in `master`
since December since changes in this gem are pretty rare unfortunately.
Let's cut a release just so we can get that change (#39) finally shipped
out.

Prepare release 0.8.0 (#37)

Prepare release 0.8.0, mostly containing the changes in #32.

Prepare release v0.7.0 (#30)

Prepare v0.7.0, containing largely the changes in #28 that add support
for past path unique job insertion.

Prepare release 0.6.1 (#27)

Prepare release 0.6.1, containing the Ruby gem fix from #26.

Prepare release 0.6.0 (#25)

Prepare release 0.6.0, which starts validating that advisory lock
prefixes fit inside of four bytes.