Bump github.com/spf13/cast from 1.4.1 to 1.6.0

Bumps [github.com/spf13/cast](https://github.com/spf13/cast) from 1.4.1 to 1.6.0.
- [Release notes](https://github.com/spf13/cast/releases)
- [Commits](spf13/cast@v1.4.1...v1.6.0)

---
updated-dependencies:
- dependency-name: github.com/spf13/cast
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

go.mod

@@ -24,7 +24,7 @@ require (
 	github.com/shirou/gopsutil v3.21.11+incompatible
 	github.com/sirupsen/logrus v1.9.3
 	github.com/songgao/water v0.0.0-20200317203138-2b4b6d7c09d8
-	github.com/spf13/cast v1.4.1
+	github.com/spf13/cast v1.6.0
 	github.com/spf13/pflag v1.0.5
 	github.com/stretchr/testify v1.8.4
 	github.com/vishvananda/netlink v1.2.1-beta.2