alpha

update cosign to the latest v1 release, v1.13.6 (#5095) #2081

Job	Run time
scan_dex	33s
generate-tag	5s
scan_rqlite	32s
scan_local_volume_provider	27s
scan_minio	34s
build-kurl-proxy-melange-packages (ubuntu-20.04, amd64)	1m 39s
build-kotsadm-melange-packages (ubuntu-20.04, amd64)	7m 35s
build-migrations-melange-packages (ubuntu-20.04, amd64)	54s
build-kurl-proxy-melange-packages (arm64-runner-set, arm64)	5m 19s
build-kotsadm-melange-packages (arm64-runner-set, arm64)	11m 1s
build-migrations-melange-packages (arm64-runner-set, arm64)	4m 34s
build-migrations	51s
build-kurl-proxy	32s
scan_kotsadm_migrations	30s
scan_kurl_proxy	23s
build-kotsadm	47s
scan_kotsadm	34s
	36m 50s

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