build(deps): bump github.com/heroku/x from 0.5.0 to 0.5.1

Bumps [github.com/heroku/x](https://github.com/heroku/x) from 0.5.0 to 0.5.1.
- [Release notes](https://github.com/heroku/x/releases)
- [Commits](heroku/x@v0.5.0...v0.5.1)

---
updated-dependencies:
- dependency-name: github.com/heroku/x
  dependency-version: 0.5.1
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

go.mod

@@ -12,7 +12,7 @@ require (
 	github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da
 	github.com/google/go-github/v73 v73.0.0
 	github.com/hashicorp/go-version v1.7.0
-	github.com/heroku/x v0.5.0
+	github.com/heroku/x v0.5.1
 	github.com/jekyll/dashboard v1.2.0
 	github.com/parkr/changelog v1.5.0
 	github.com/parkr/githubapi v0.1.0

go.sum

@@ -20,8 +20,8 @@ github.com/google/go-querystring v1.1.0 h1:AnCroh3fv4ZBgVIf1Iwtovgjaw/GiKJo8M8yD
 github.com/google/go-querystring v1.1.0/go.mod h1:Kcdr2DB4koayq7X8pmAG4sNG59So17icRSOU623lUBU=
 github.com/hashicorp/go-version v1.7.0 h1:5tqGy27NaOTB8yJKUZELlFAS/LTKJkrmONwQKeRZfjY=
 github.com/hashicorp/go-version v1.7.0/go.mod h1:fltr4n8CU8Ke44wwGCBoEymUuxUHl09ZGVZPK5anwXA=
-github.com/heroku/x v0.5.0 h1:s5R0vp9j0enY+ZIc2kk54hhDkJrHjC4E64i98gmSZLQ=
-github.com/heroku/x v0.5.0/go.mod h1:m6r9CVMysn6E9K7s3yE66TM7O+nWFqr7G2ZMqS4TLjU=
+github.com/heroku/x v0.5.1 h1:Li4p4+MKiAdJXKYU4k6d5RoBYijO5OGL014a2su2oJ4=
+github.com/heroku/x v0.5.1/go.mod h1:+NbJydzrphlrl5nys0tjOCwajqlup8N3lJ+EVbQ+Sa0=
 github.com/jekyll/dashboard v1.2.0 h1:3A6oH/ilx6hdN212jKc6PzKO5uDSvNUBo1H1LkGFVUA=
 github.com/jekyll/dashboard v1.2.0/go.mod h1:TFh059o5ilGM/bzDVBKe6KZJHaGi4HcKF1HpntnWODE=
 github.com/parkr/changelog v1.5.0 h1:0alBbyDk+O2FDCUmTzvKtJwOg0dG2Z4/VulZGPsPmIE=