Update buildkite plugin plugin-linter to v3.1.0

[renovate[bot]]

This PR contains the following updates:

Package	Update	Change
plugin-linter	minor	v3.0.0 -> v3.1.0

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Release Notes

buildkite-plugins/plugin-linter-buildkite-plugin

### [`v3.1.0`](https://togithub.com/buildkite-plugins/plugin-linter-buildkite-plugin/releases/tag/v3.1.0): (🥑 Guacamole) [Compare Source](https://togithub.com/buildkite-plugins/plugin-linter-buildkite-plugin/compare/v3.0.0...v3.1.0) #### Changed: - Pin image to actual version ([#​48](https://togithub.com/buildkite-plugins/plugin-linter-buildkite-plugin/issues/48)) [@​toote](https://togithub.com/toote) - Update Linter image tag version ([#​49](https://togithub.com/buildkite-plugins/plugin-linter-buildkite-plugin/issues/49)) [@​pzeballos](https://togithub.com/pzeballos) #### Upgrading To upgrade, update your `pipeline.yml` files: ```diff steps: - plugins: - plugin-linter#v3.0.0: + plugin-linter#v3.1.0: id: my-org/my-plugin ```

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Configuration

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