build(deps): bump github.com/mattn/go-colorable from 0.1.7 to 0.1.8 (#1413)

Bumps [github.com/mattn/go-colorable](https://github.com/mattn/go-colorable) from 0.1.7 to 0.1.8.
- [Release notes](https://github.com/mattn/go-colorable/releases)
- [Commits](mattn/go-colorable@v0.1.7...v0.1.8)

Signed-off-by: dependabot[bot] <support@github.com>
Signed-off-by: Xiang Dai <long0dai@foxmail.com>
Co-authored-by: Xiang Dai <long0dai@foxmail.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

go.mod

@@ -31,7 +31,7 @@ require (
 	github.com/kyoh86/exportloopref v0.1.7
 	github.com/maratori/testpackage v1.0.1
 	github.com/matoous/godox v0.0.0-20190911065817-5d6d842e92eb // v1.0
-	github.com/mattn/go-colorable v0.1.7
+	github.com/mattn/go-colorable v0.1.8
 	github.com/mitchellh/go-homedir v1.1.0
 	github.com/mitchellh/go-ps v1.0.0
 	github.com/moricho/tparallel v0.2.1