JetBrains: Add necessary dependency
Created by: vdavid
Got a failure when publishing 2.0:
> Task :verifyPlugin
[gradle-intellij-plugin :Sourcegraph:verifyPlugin] Plugin descriptor plugin.xml does not include any module dependency tags. The plugin is assumed to be a legacy plugin and is loaded only in IntelliJ IDEA. See https://plugins.jetbrains.com/docs/intellij/plugin-compatibility.html
> Task :publishPlugin FAILED
According to this section of the docs: https://plugins.jetbrains.com/docs/intellij/plugin-compatibility.html#modules-available-in-all-products the dependency I just added is needed.
Test plan
Publishing succeeded right after adding this!
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