go.mod: update DataDog/sketches-go to 1.2.1

sketches-go@v1.0.0 contains some bugs which are fixed in v1.2.1

Fixes #1021

go.mod

@@ -7,7 +7,7 @@ require (
 	github.com/DataDog/datadog-agent/pkg/obfuscate v0.0.0-20211129110424-6491aa3bf583
 	github.com/DataDog/datadog-go/v5 v5.0.2
 	github.com/DataDog/gostackparse v0.5.0
-	github.com/DataDog/sketches-go v1.0.0
+	github.com/DataDog/sketches-go v1.2.1
 	github.com/Shopify/sarama v1.22.0
 	github.com/aws/aws-sdk-go v1.34.28
 	github.com/aws/aws-sdk-go-v2 v1.0.0

go.sum

@@ -55,6 +55,8 @@ github.com/DataDog/gostackparse v0.5.0 h1:jb72P6GFHPHz2W0onsN51cS3FkaMDcjb0Qzgxx
 github.com/DataDog/gostackparse v0.5.0/go.mod h1:lTfqcJKqS9KnXQGnyQMCugq3u1FP6UZMfWR0aitKFMM=
 github.com/DataDog/sketches-go v1.0.0 h1:chm5KSXO7kO+ywGWJ0Zs6tdmWU8PBXSbywFVciL6BG4=
 github.com/DataDog/sketches-go v1.0.0/go.mod h1:O+XkJHWk9w4hDwY2ZUDU31ZC9sNYlYo8DiFsxjYeo1k=
+github.com/DataDog/sketches-go v1.2.1 h1:qTBzWLnZ3kM2kw39ymh6rMcnN+5VULwFs++lEYUUsro=
+github.com/DataDog/sketches-go v1.2.1/go.mod h1:1xYmPLY1So10AwxV6MJV0J53XVH+WL9Ad1KetxVivVI=
 github.com/DataDog/zstd v1.3.5 h1:DtpNbljikUepEPD16hD4LvIcmhnhdLTiW/5pHgbmp14=
 github.com/DataDog/zstd v1.3.5/go.mod h1:1jcaCB/ufaK+sKp1NBhlGmpz41jOoPQ35bpF36t7BBo=
 github.com/Masterminds/semver/v3 v3.1.1 h1:hLg3sBzpNErnxhQtUy/mmLR2I9foDujNK030IGemrRc=