chore(deps): update dependency backport to v9

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
backport (source)	^8.9.8 -> ^9.4.1

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Release Notes

sqren/backport (backport)

v9.3.0

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What's Changed

• Add --copy-source-pr-labels option and rename --add-original-reviewers to --copy-source-pr-reviewers by @​sqren in https://github.com/sqren/backport/pull/474

v9.2.3

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Improve prTitle and prDescription templating (sorenlouv/backport@18acd4f)

v9.2.2: 9.2.2 fix: auto merge not running

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What's Changed

• fix: auto merge not running when there's no conflicts by @​nicklasmoeller in https://github.com/sqren/backport/pull/473

v9.2.1

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v9.2.0: Added addOriginalReviewers option

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https://github.com/sqren/backport/pull/452

This addOriginalReviewers option. It is disabled by default. When enabled it will add the original reviewers from the source pull request to the target pull request.

v9.1.1: Throw on insufficient scopes

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Now the access token is checked for the required scopes (repo scope for private repos and public_repo for public repos) and aborts with an error if it doesn't.

v9.1.0: Add commitConflicts option

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Add support for committing conflicts (https://github.com/sqren/backport/pull/470)
This release introduces commitConflicts: boolean option. It is disabled by default. When enabled it will commit conflicting files when running on CI.

v9.0.0: Add support for handlebars templating engine

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Breaking changes:

• Add support for handlebars templating engine #​468

The changes to the templating engine requires changes to the options prTitle and prDescription if used. Previously these used single braces like {targetBranch}. This now needs to be double braces {{targetBranch}}. Please see the docs for more info.

v8.9.9

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