Bump github.com/cenkalti/backoff/v4 from 4.2.0 to 4.2.1 (#479)

Bumps [github.com/cenkalti/backoff/v4](https://github.com/cenkalti/backoff) from 4.2.0 to 4.2.1.
- [Release notes](https://github.com/cenkalti/backoff/releases)
- [Commits](cenkalti/backoff@v4.2.0...v4.2.1)

---
updated-dependencies:
- dependency-name: github.com/cenkalti/backoff/v4
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

go.mod

@@ -15,7 +15,7 @@ require (
 	github.com/blang/semver v3.5.1+incompatible
 	github.com/bmatcuk/doublestar v1.2.2 // indirect
 	github.com/bmizerany/pat v0.0.0-20170815010413-6226ea591a40 // indirect
-	github.com/cenkalti/backoff/v4 v4.2.0
+	github.com/cenkalti/backoff/v4 v4.2.1
 	github.com/charlievieth/fs v0.0.0-20170613215519-7dc373669fa1 // indirect
 	github.com/cloudfoundry/bosh-cli v5.5.0+incompatible // indirect
 	github.com/cloudfoundry/bosh-utils v0.0.0-20190518100210-9f9df32d41c3 // indirect

go.sum

@@ -231,8 +231,8 @@ github.com/bmatcuk/doublestar v1.2.2 h1:oC24CykoSAB8zd7XgruHo33E0cHJf/WhQA/7BeXj
 github.com/bmatcuk/doublestar v1.2.2/go.mod h1:wiQtGV+rzVYxB7WIlirSN++5HPtPlXEo9MEoZQC/PmE=
 github.com/bmizerany/pat v0.0.0-20170815010413-6226ea591a40 h1:y4B3+GPxKlrigF1ha5FFErxK+sr6sWxQovRMzwMhejo=
 github.com/bmizerany/pat v0.0.0-20170815010413-6226ea591a40/go.mod h1:8rLXio+WjiTceGBHIoTvn60HIbs7Hm7bcHjyrSqYB9c=
-github.com/cenkalti/backoff/v4 v4.2.0 h1:HN5dHm3WBOgndBH6E8V0q2jIYIR3s9yglV8k/+MN3u4=
-github.com/cenkalti/backoff/v4 v4.2.0/go.mod h1:Y3VNntkOUPxTVeUxJ/G5vcM//AlwfmyYozVcomhLiZE=
+github.com/cenkalti/backoff/v4 v4.2.1 h1:y4OZtCnogmCPw98Zjyt5a6+QwPLGkiQsYW5oUqylYbM=
+github.com/cenkalti/backoff/v4 v4.2.1/go.mod h1:Y3VNntkOUPxTVeUxJ/G5vcM//AlwfmyYozVcomhLiZE=
 github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
 github.com/cespare/xxhash v1.1.0/go.mod h1:XrSqR1VqqWfGrhpAt58auRo0WTKS1nRRg3ghfAqPWnc=
 github.com/cespare/xxhash/v2 v2.1.1/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=