Bump github.com/sirupsen/logrus from 1.7.0 to 1.8.1

Bumps [github.com/sirupsen/logrus](https://github.com/sirupsen/logrus) from 1.7.0 to 1.8.1.
- [Release notes](https://github.com/sirupsen/logrus/releases)
- [Changelog](https://github.com/sirupsen/logrus/blob/master/CHANGELOG.md)
- [Commits](sirupsen/logrus@v1.7.0...v1.8.1)

Signed-off-by: dependabot[bot] <support@github.com>

go.mod

@@ -18,7 +18,7 @@ require (
 	github.com/prometheus/client_golang v1.9.0
 	github.com/prometheus/procfs v0.3.0 // indirect
 	github.com/rcrowley/go-metrics v0.0.0-20201227073835-cf1acfcdf475 // indirect
-	github.com/sirupsen/logrus v1.7.0
+	github.com/sirupsen/logrus v1.8.1
 	github.com/stretchr/testify v1.7.0
 	github.com/tidwall/pretty v1.0.1 // indirect
 	github.com/xdg/stringprep v1.0.0 // indirect