Bump github.com/rs/zerolog from 1.20.0 to 1.21.0

Bumps [github.com/rs/zerolog](https://github.com/rs/zerolog) from 1.20.0 to 1.21.0.
- [Release notes](https://github.com/rs/zerolog/releases)
- [Commits](rs/zerolog@v1.20.0...v1.21.0)

Signed-off-by: dependabot[bot] <[email protected]>

go.mod

@@ -4,7 +4,7 @@ go 1.16
 
 require (
 	github.com/pkg/errors v0.9.1
-	github.com/rs/zerolog v1.20.0
+	github.com/rs/zerolog v1.21.0
 	github.com/stretchr/testify v1.7.0
 	github.com/wtsi-npg/logshim v1.2.0
 )

go.sum

@@ -7,20 +7,35 @@ github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINE
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-github.com/rs/zerolog v1.20.0 h1:38k9hgtUBdxFwE34yS8rTHmHBa4eN16E4DJlv177LNs=
-github.com/rs/zerolog v1.20.0/go.mod h1:IzD0RJ65iWH0w97OQQebJEvTZYvsCUm9WVLWBQrJRjo=
+github.com/rs/zerolog v1.21.0 h1:Q3vdXlfLNT+OftyBHsU0Y445MD+8m8axjKgf2si0QcM=
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