fix(deps): update module github.com/cenkalti/backoff/v4 to v4.2.1 (#29419)

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This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
|
[github.com/cenkalti/backoff/v4](https://togithub.com/cenkalti/backoff)
| require | patch | `v4.2.0` -> `v4.2.1` |

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### Release Notes

<details>
<summary>cenkalti/backoff (github.com/cenkalti/backoff/v4)</summary>

###
[`v4.2.1`](https://togithub.com/cenkalti/backoff/compare/v4.2.0...v4.2.1)

[Compare
Source](https://togithub.com/cenkalti/backoff/compare/v4.2.0...v4.2.1)

</details>

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cmd/opampsupervisor/go.mod

@@ -3,7 +3,7 @@ module github.com/open-telemetry/opentelemetry-collector-contrib/cmd/opampsuperv
 go 1.20
 
 require (
-	github.com/cenkalti/backoff/v4 v4.2.0
+	github.com/cenkalti/backoff/v4 v4.2.1
 	github.com/knadh/koanf/parsers/yaml v0.1.0
 	github.com/knadh/koanf/providers/file v0.1.0
 	github.com/knadh/koanf/providers/rawbytes v0.1.0