chore(deps): update dependency com.amashchenko.maven.plugin:gitflow-maven-plugin to v1.21.0

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
com.amashchenko.maven.plugin:gitflow-maven-plugin	1.20.0 -> 1.21.0

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Release Notes

aleksandr-m/gitflow-maven-plugin (com.amashchenko.maven.plugin:gitflow-maven-plugin)

### [`v1.21.0`](https://togithub.com/aleksandr-m/gitflow-maven-plugin/blob/HEAD/CHANGELOG.md#v1210-2023-12-25) [Compare Source](https://togithub.com/aleksandr-m/gitflow-maven-plugin/compare/v1.20.0...v1.21.0) - Updated Java minimum version to 8 - [#​369](https://togithub.com/aleksandr-m/gitflow-maven-plugin/issues/369) - Added console prompter wrapper

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Configuration

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[renovate[bot]]

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Quality Gate passed

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