deps: bump version of slsa generator

[asraa]

Signed-off-by: Asra Ali asraa@google.com

We just updated the generators because of a breaking change in verification flows due to a rekor sharding rollout

[imjasonh]

Thanks Asra! 🎉

[imjasonh]

This happened again on the release of v0.12.1: https://github.com/google/go-containerregistry/actions/runs/3439316070/jobs/5736576729

}: unable to fetch Rekor public keys from TUF repository, trying Redis search index to find entries by subject digest
FAILED: SLSA verification failed: could not find a matching valid signature entry: got unexpected errors updating local metadata and targets: error updating to TUF remote mirror: tuf: invalid key
remote status:{
	"mirror": "https://sigstore-tuf-root.storage.googleapis.com/",
	"metadata": {
		"root.json": {
			"version": 5,
			"len": 6388,
			"expiration": "18 Apr 23 18:13 UTC",
			"error": ""
		},
		"snapshot.json": {
			"version": 54,
			"len": 1977,
			"expiration": "21 Nov 22 15:59 UTC",
			"error": ""
		},
		"targets.json": {
			"version": 5,
			"len": 4188,
			"expiration": "18 Apr 23 18:13 UTC",
			"error": ""
		},
		"timestamp.json": {
			"version": 54,
			"len": 719,
			"expiration": "14 Nov 22 15:59 UTC",
			"error": ""
		}
	}
}: unable to fetch Rekor public keys from TUF repository: verifying tlog entry 24296fb24b8ad77aa554c72040fd95aa256c746048e580348fe27258d8a2aad641dc3d0842bb23f3

[asraa]

This happened again on the release of v0.12.1: https://github.com/google/go-containerregistry/actions/runs/3439316070/jobs/5736576729

Hi! I think this ends up resolved by #1489
I'm sorry :| After Sigstore GA older libraries were incompatible and needed updating. It should be stable going forward.