[release-1.15] Bump to v1.15.2

As the title says, bumping to v1.15.2

Signed-off-by: tomsweeneyredhat <tsweeney@redhat.com>

[release-1.14] Bump to v1.14.5

As the title says.  To be used to deliver the jfrog
artifactory fix.

Signed-off-by: tomsweeneyredhat <tsweeney@redhat.com>

Bump to v1.15.0

Given the big changes in c/common, c/image and c/storage, I think
it makes sense to create Skopeo v1.15.0 now to go out with Podman v5.0
and Buildah v1.35.

[NO NEW TESTS NEEDED]

Signed-off-by: tomsweeneyredhat <tsweeney@redhat.com>