chore: Bump Claircore to v1.4.21

Bump Claircore to the latest tag.

Signed-off-by: crozzy <joseph.crosland@gmail.com>

go.mod

@@ -13,7 +13,7 @@ require (
 	github.com/ldelossa/responserecorder v1.0.2-0.20210711162258-40bec93a9325
 	github.com/prometheus/client_golang v1.14.0
 	github.com/quay/clair/config v1.1.3
-	github.com/quay/claircore v1.4.20
+	github.com/quay/claircore v1.4.21
 	github.com/quay/zlog v1.1.4
 	github.com/remind101/migrate v0.0.0-20170729031349-52c1edff7319
 	github.com/rs/zerolog v1.29.0

go.sum

@@ -735,8 +735,8 @@ github.com/quay/alas v1.0.1 h1:MuFpGGXyZlDD7+F/hrnMZmzhS8P2bjRzX9DyGmyLA+0=
 github.com/quay/alas v1.0.1/go.mod h1:pseepSrG9pwry1joG7RO/RNRFJaWqiqx9qeoomeYwEk=
 github.com/quay/clair/config v1.1.3 h1:z9wmMQFJASQZwQKSTH3VV1A37dov10mLgutUSRBM4cI=
 github.com/quay/clair/config v1.1.3/go.mod h1:3mfaS7n0V/+lHMJ72SBbaiD+fTi/us1j/Ad8fvE6j5U=
-github.com/quay/claircore v1.4.20 h1:1IJl/KQ0mYoPSgVdwlhBSNC7FKECDAwyjfDbw5HhiW0=
-github.com/quay/claircore v1.4.20/go.mod h1:0BllrX5SNFLzS9AibQVvFbH77Yr3wH2iaULbE2Y3WIQ=
+github.com/quay/claircore v1.4.21 h1:xcN8CiW8M5ToSmTN0WeSu7dX58c+sD83zylhO/kNNnA=
+github.com/quay/claircore v1.4.21/go.mod h1:0BllrX5SNFLzS9AibQVvFbH77Yr3wH2iaULbE2Y3WIQ=
 github.com/quay/claircore/toolkit v1.0.0 h1:FiAo/URPMa62D9KN0YhyK+ATObtXl4I8/Jsf69GEHYM=
 github.com/quay/claircore/toolkit v1.0.0/go.mod h1:3ELtgf92x7o1JCTSKVOAqhcnCTXc4s5qiGaEDx62i20=
 github.com/quay/claircore/updater/driver v1.0.0 h1:w7dAUjO3GBK6RjNyTZ2Kwz0l/Wuic3ykKJWPB80uA94=