Update module cenkalti/backoff to v4

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
github.com/cenkalti/backoff	require	major	v2.2.1+incompatible -> v4.0.2

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Release Notes

cenkalti/backoff

v4.0.2

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v4.0.1

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v4.0.0

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v3.2.2

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v3.2.1

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v3.2.0

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v3.1.2

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v3.1.1

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v3.1.0

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v3.0.0

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♻️ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

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[renovate]

⚠️ Artifact update problem

Renovate failed to update an artifact related to this branch. You probably do not want to merge this PR as-is.

♻️ Renovate will retry this branch, including artifacts, only when one of the following happens:

• any of the package files in this branch needs updating, or
• the branch becomes conflicted, or
• you check the rebase/retry checkbox if found above, or
• you rename this PR's title to start with "rebase!" to trigger it manually

The artifact failure details are included below:

File name: go.sum

Command failed: docker run --rm --name=renovate_go --label=renovate_child -v "/mnt/renovate/gh/golangci/golangci-api":"/mnt/renovate/gh/golangci/golangci-api" -v "/tmp/renovate-cache":"/tmp/renovate-cache" -v "/tmp/renovate-cache/others/go":"/tmp/renovate-cache/others/go" -e GOPATH -e CGO_ENABLED -w "/mnt/renovate/gh/golangci/golangci-api" renovate/go bash -l -c "git config --global url.\"https://x-access-token:**redacted**@github.com/\".insteadOf \"https://github.com/\" && go get -d ./..."
go: downloading github.com/levigross/grequests v0.0.0-20190908174114-253788527a1a
go: downloading github.com/aws/aws-sdk-go v1.28.5
go: downloading github.com/joho/godotenv v1.3.0
go: downloading github.com/go-kit/kit v0.9.0
go: downloading github.com/shirou/gopsutil v0.0.0-20190901111213-e4ec7b275ada
go: downloading github.com/golang/mock v1.3.1
go: downloading github.com/gavv/httpexpect v0.0.0-20170820080527-c44a6d7bb636
go: downloading github.com/mattes/migrate v0.0.0-20171208214826-d23f71b03c4a
go: downloading github.com/sirupsen/logrus v1.4.2
go: downloading golang.org/x/tools v0.0.0-20190930201159-7c411dea38b0
go: downloading github.com/google/go-querystring v1.0.0
go: downloading github.com/jinzhu/gorm v1.9.12
go: downloading golang.org/x/net v0.0.0-20190923162816-aa69164e4478
go: downloading github.com/yudai/gojsondiff v1.0.0
go: downloading github.com/gorilla/securecookie v1.1.1
go: downloading github.com/konsorten/go-windows-terminal-sequences v1.0.1
go: downloading github.com/golangci/golangci-lint v1.20.0
go: downloading github.com/dukex/mixpanel v0.0.0-20180925151559-f8d5594f958e
go: downloading gopkg.in/redsync.v1 v1.0.1
go: downloading golang.org/x/sys v0.0.0-20191026070338-33540a1f6037
go: downloading github.com/getsentry/raven-go v0.2.0
go: downloading github.com/satori/go.uuid v1.2.0
go: downloading github.com/moul/http2curl v1.0.0
go: downloading github.com/gorilla/sessions v1.1.3
go: downloading github.com/xeipuuv/gojsonschema v1.1.0
go: downloading github.com/pkg/errors v0.9.1
go: downloading github.com/yalp/jsonpath v0.0.0-20180802001716-5cc68e5049a0
go: downloading github.com/savaki/amplitude-go v0.0.0-20160610055645-f62e3b57c0e4
go: downloading github.com/rs/cors v1.6.0
go: downloading github.com/stvp/rollbar v0.5.1
go: downloading github.com/garyburd/redigo v1.6.0
verifying github.com/golangci/[email protected]: checksum mismatch
	downloaded: h1:BRmroXvnikbTCJJ+wbBgbt2kfbDC5RGONSK8xL9D6eo=
	go.sum:     h1:bokjFHRgut7TT9YiKSVWVscWfZNs1fQgSz94geGPHJw=

SECURITY ERROR
This download does NOT match an earlier download recorded in go.sum.
The bits may have been replaced on the origin server, or an attacker may
have intercepted the download attempt.

For more information, see 'go help module-auth'.