feat(manager/gradle): add support for map notation deps in Groovy maps

[Churro]

Changes

While working on #20763, I found that map notation dependencies are currently not matched if occurring within Groovy maps. This is because map assignments are parsed prior to dependencies and the Groovy map already causes a match.

In practice, this means the dependency in the following snippet wouldn't be matched at all:

ext {
  aspectj = [group: 'org.aspectj', name: 'aspectjrt', version: '1.6.12']
}

dependencies {
  runtime(aspectj)
}

This PR adds an additional clause to the Groovy map assignment that distinguishes between regular maps and map notation deps within maps.

Context

• feat(manager/gradle): add support for Groovy and Kotlin maps #19127

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I have verified these changes via:

• Code inspection only, or
• Newly added/modified unit tests, or
• No unit tests but ran on a real repository, or
• Both unit tests + ran on a real repository

[renovate-release]

🎉 This PR is included in version 34.159.0 🎉

The release is available on:

• GitHub release
• 34.159.0

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