update dependency

Signed-off-by: Shiwei Zhang <shizh@microsoft.com>

go.mod

@@ -5,10 +5,10 @@ go 1.16
 replace (
 	// WARNING! Do NOT replace these without also replacing their lines in the `require` stanza below.
 	// These `replace` stanzas are IGNORED when this is imported as a library
-	github.com/containerd/containerd => github.com/notaryproject/containerd v1.5.0-beta.4.0.20210409054504-dff6ab0d7741
+	github.com/containerd/containerd => github.com/notaryproject/containerd v1.5.0-beta.4.0.20210414031158-5724862e07ff
 	github.com/docker/distribution => github.com/docker/distribution v0.0.0-20191216044856-a8371794149d
 	github.com/docker/docker => github.com/moby/moby v17.12.0-ce-rc1.0.20200618181300-9dc6525e6118+incompatible
-	github.com/opencontainers/artifacts => github.com/aviral26/artifacts v0.0.0-20210331072334-fac4f3a4da4e
+	github.com/opencontainers/artifacts => github.com/notaryproject/artifacts v0.0.0-20210414030140-c7c701eff45d
 )
 
 require (

go.sum

@@ -60,8 +60,6 @@ github.com/armon/circbuf v0.0.0-20150827004946-bbbad097214e/go.mod h1:3U/XgcO3hC
 github.com/armon/go-metrics v0.0.0-20180917152333-f0300d1749da/go.mod h1:Q73ZrmVTwzkszR9V5SSuryQ31EELlFMUz1kKyl939pY=
 github.com/armon/go-radix v0.0.0-20180808171621-7fddfc383310/go.mod h1:ufUuZ+zHj4x4TnLV4JWEpy2hxWSpsRywHrMgIH9cCH8=
 github.com/asaskevich/govalidator v0.0.0-20190424111038-f61b66f89f4a/go.mod h1:lB+ZfQJz7igIIfQNfa7Ml4HSf2uFQQRzpGGRXenZAgY=
-github.com/aviral26/artifacts v0.0.0-20210331072334-fac4f3a4da4e h1:PpLNjTpAp5mTxkuUdM2vCPckrXBPszurJQFvdFUaV1A=
-github.com/aviral26/artifacts v0.0.0-20210331072334-fac4f3a4da4e/go.mod h1:IBQOjhxIKxb9G4h9NiWAJLGBgKPlIy27tcpPDTAfUQw=
 github.com/aws/aws-sdk-go v1.15.11/go.mod h1:mFuSZ37Z9YOHbQEwBWztmVzqXrEkub65tZoCYDt7FT0=
 github.com/beorn7/perks v0.0.0-20160804104726-4c0e84591b9a/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=
 github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=
@@ -373,8 +371,10 @@ github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822/go.mod h1:+n7T8m
 github.com/mwitkow/go-conntrack v0.0.0-20161129095857-cc309e4a2223/go.mod h1:qRWi+5nqEBWmkhHvq77mSJWrCKwh8bxhgT7d/eI7P4U=
 github.com/mxk/go-flowrate v0.0.0-20140419014527-cca7078d478f/go.mod h1:ZdcZmHo+o7JKHSa8/e818NopupXU1YMK5fe1lsApnBw=
 github.com/ncw/swift v1.0.47/go.mod h1:23YIA4yWVnGwv2dQlN4bB7egfYX6YLn0Yo/S6zZO/ZM=
-github.com/notaryproject/containerd v1.5.0-beta.4.0.20210409054504-dff6ab0d7741 h1:V84LH9+jt3mV33wxqcIRhkw4XV/JB2ysxwLSdehHB58=
-github.com/notaryproject/containerd v1.5.0-beta.4.0.20210409054504-dff6ab0d7741/go.mod h1:M2AN4kZXqb1TTfFUByX/LrJrKeyZI421E4eXuZ1WDhk=
+github.com/notaryproject/artifacts v0.0.0-20210414030140-c7c701eff45d h1:GtjfjCO9nJX0zBaJ5bRtGjEFKflmdtYcn7sr7hgllHE=
+github.com/notaryproject/artifacts v0.0.0-20210414030140-c7c701eff45d/go.mod h1:IBQOjhxIKxb9G4h9NiWAJLGBgKPlIy27tcpPDTAfUQw=
+github.com/notaryproject/containerd v1.5.0-beta.4.0.20210414031158-5724862e07ff h1:VUtdbXfFjT5b1/wO3Rs320rV1axRg9ow8vaXTcMmU1Q=
+github.com/notaryproject/containerd v1.5.0-beta.4.0.20210414031158-5724862e07ff/go.mod h1:VMsSqat+Y2ZaXuQZl7COtOkGB1n9PFxu7KKTBXkNtt0=
 github.com/oklog/ulid v1.3.1/go.mod h1:CirwcVhetQ6Lv90oh/F+FBtV6XMibvdAFo93nm5qn4U=
 github.com/olekukonko/tablewriter v0.0.0-20170122224234-a0225b3f23b5/go.mod h1:vsDQFd/mU46D+Z4whnwzcISnGGzXWMclvtLoiIKAKIo=
 github.com/onsi/ginkgo v0.0.0-20151202141238-7f8ab55aaf3b/go.mod h1:lLunBs/Ym6LB5Z9jYTR76FiuTmxDTDusOGeTQH+WWjE=