Bump ostree-ext and cap-std

[cgwalters]

Note both ostree-ext and us depend on cap-std/rustix, so we
should keep those in lockstep to avoid duplication.

We can drop the cap-primitives dependency now.

[cgwalters]

Argh, right I think ostreedev/ostree-rs-ext#220 broke backwards compatibility. We need to make the "inject mode bits into tar stream" continue to happen in v0 format or so - @lucab want to do that or should I?

[cgwalters]

Upgrade tests are failing:

[2022-01-26T15:56:08.240Z] --- FAIL: fcos.upgrade.basic (53.75s)
[2022-01-26T15:56:08.240Z]     --- FAIL: fcos.upgrade.basic/setup (27.02s)
[2022-01-26T15:56:08.240Z]             cluster.go:213: "rpm-ostree ex-container import --repo=/var/srv/upgrade/repo-bare --write-ref fedora/x86_64/coreos/next ostree-unverified-image:oci-archive:fedora-coreos-35.20220126.dev.0-ostree.x86_64.ociarchive:latest" failed: Process exited with status 1; logs from journalctl -t kola:
[2022-01-26T15:56:08.240Z]     + ostree --repo=/var/srv/upgrade/repo-bare init --mode=bare-user
[2022-01-26T15:56:08.240Z]     + rpm-ostree ex-container import --repo=/var/srv/upgrade/repo-bare --write-ref fedora/x86_64/coreos/next ostree-unverified-image:oci-archive:fedora-coreos-35.20220126.dev.0-ostree.x86_64.ociarchive:latest
[2022-01-26T15:56:08.240Z]     error: Importing ostree-unverified-image:oci-archive:fedora-coreos-35.20220126.dev.0-ostree.x86_64.ociarchive:latest: Parsing blob sha256:830ed6ce6a92aada6b4e4243c1b9a9807f0d433dc17b23a8eb9f6d2172c5adec: object 7f/b2bf47d8f85065a1e23102c77212df527c560d9b04ca33a83cd191aabc6d3d.file: Processing content object 7fb2bf47d8f85065a1e23102c77212df527c560d9b04ca33a83cd191aabc6d3d: Writing content object: Unsupported file type 0

[cgwalters]

OK exciting, new failure in the upgrade tests:

Jan 27 15:12:20.941468 rpm-ostree[1125]: error: Couldn't start daemon: Error setting up sysroot: loading sysroot: Unexpected state: /run/ostree-booted found, but no /boot/loader directory

I don't understand that.

[cgwalters]

Oh wait I see this time the basic kola test immediately dies too with:

[ 2.068661] ostree-prepare-root[212]: ostree-prepare-root: Couldn't find specified OSTree root '/sysroot//ostree/boot.1/fedora-coreos/18c33ffc57e373e88aca2a9204bf89f826d49d862b454001e9fa302bfa352e9d/0': No such file or directory[ 2.224449] systemd[1]: Stopped OSTree Prepare OS/.

So something more fundamental is wrong here. Did another PR with just doc changes to sanity check CI.

[lucab]

In the upgrade failure, it looks like indeed the mount unit for /boot did not run. Puzzling.

[cgwalters]

Rebased 🏄

[cgwalters]

/retest