Update buildkite plugin monorepo-diff to v1.9.0

[elastic-renovate-prod]

This PR contains the following updates:

Package	Update	Change
monorepo-diff	minor	v1.5.1 -> v1.9.0

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Release Notes

buildkite-plugins/monorepo-diff-buildkite-plugin (monorepo-diff)

v1.9.0

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Added

• Add step validation to skip invalid configurations with helpful warnings (#​158)
• Add SHA256 checksum verification for downloaded binaries (#​155)
• Add map format support for env configuration with null literal support for reading from OS environment (#​154)
• Preserve and display plugins defined within command steps in README documentation (#​157)

Fixed

• Fix notify processing in group steps (#​156)

v1.8.0

Compare Source

Added

• Accept both artifact_paths (preferred) and artifacts (alternative) field names in plugin configuration for backward compatibility (#​151)
• Keep the binary in the plugin directory instead of build directory (#​135)

Changed

• Update module github.com/bmatcuk/doublestar/v4 to v4.10.0 (#​150)
• Update dependency go to v1.25.7 (#​152)
• Update module github.com/sirupsen/logrus to v1.9.4 (#​146)
• Update dependency go to v1.25.6 (#​147)
• Update buildkite plugin secrets to v2 (#​149)

Fixed

• Fix artifact_paths field being ignored when specified in plugin configuration (#​151)
• Have download: false respect binary_folder configuration (#​148)

v1.7.0

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Added

• Add support for secrets field in step configuration (#​137)

v1.6.2

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Fixed

• Fix env parsing of complex values with equals signs (#​141)

Changed

• Update versions in README (#​142)

v1.6.1

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Added

• Add download configuration option to support pre-installed binaries (#​130)
• Add retry logic for binary download to handle transient network issues (#​138)

v1.6.0

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Added

• Add support for key in watch config steps by @​toadzky in https://github.com/buildkite-plugins/monorepo-diff-buildkite-plugin/pull/133

Changed

• Perform an update check instead of downloading the binary every run by @​JanSF in https://github.com/buildkite-plugins/monorepo-diff-buildkite-plugin/pull/127

v1.5.2

Compare Source

Added

• Add support for depends_on in step definitions by @​jasonwbarnett in https://github.com/buildkite-plugins/monorepo-diff-buildkite-plugin/pull/123

Changed

• Perform an update check instead of downloading the binary every run by @​JanSF in https://github.com/buildkite-plugins/monorepo-diff-buildkite-plugin/pull/122
• Revert the update check change by @​pzeballos in https://github.com/buildkite-plugins/monorepo-diff-buildkite-plugin/pull/126
• Maintenance updates to Go/tooling dependencies by @​renovate[bot]

Fixed

• Fix unicode handling in git diff output by @​scadu in https://github.com/buildkite-plugins/monorepo-diff-buildkite-plugin/pull/131

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