build(deps): bump gopkg.in/DataDog/dd-trace-go.v1 from 1.27.1 to 1.28.0 (#4360)

Bumps [gopkg.in/DataDog/dd-trace-go.v1](https://github.com/DataDog/dd-trace-go) from 1.27.1 to 1.28.0.
- [Release notes](https://github.com/DataDog/dd-trace-go/releases)
- [Commits](https://github.com/DataDog/dd-trace-go/compare/v1.27.1...v1.28.0)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>
Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

go.mod

@@ -35,7 +35,7 @@ require (
 	golang.org/x/sys v0.0.0-20201214210602-f9fddec55a1e
 	google.golang.org/api v0.29.0
 	google.golang.org/grpc v1.29.1
-	gopkg.in/DataDog/dd-trace-go.v1 v1.27.1
+	gopkg.in/DataDog/dd-trace-go.v1 v1.28.0
 	k8s.io/api v0.20.1
 	k8s.io/apimachinery v0.20.1
 	k8s.io/client-go v0.20.1

go.sum

@@ -760,6 +760,7 @@ google.golang.org/protobuf v1.25.0 h1:Ejskq+SyPohKW+1uil0JJMtmHCgJPJ/qWTxr8qp+R4
 google.golang.org/protobuf v1.25.0/go.mod h1:9JNX74DMeImyA3h4bdi1ymwjUzf21/xIlbajtzgsN7c=
 gopkg.in/DataDog/dd-trace-go.v1 v1.27.1 h1:9BJfwtuCUrUiNB3WCTXHuaP5E/J/zfMPUUaRJoEQfdc=
 gopkg.in/DataDog/dd-trace-go.v1 v1.27.1/go.mod h1:Sp1lku8WJMvNV0kjDI4Ni/T7J/U3BO5ct5kEaoVU8+I=
+gopkg.in/DataDog/dd-trace-go.v1 v1.28.0/go.mod h1:Sp1lku8WJMvNV0kjDI4Ni/T7J/U3BO5ct5kEaoVU8+I=
 gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=