Add Mannequin user type to GitHubUserType enum

[Copilot]

GitHub's API returns "Mannequin" as a user type for placeholder accounts created during repository migrations. These represent deleted or inaccessible users.

Changes

• Added MANNEQUIN to GitHubUserType enum with @SerialName("Mannequin") annotation
• Added test coverage for Mannequin user type parsing

Usage

val user = GitHubUser(
    id = 12345,
    login = "ghost",
    type = GitHubUserType.MANNEQUIN,
    avatarUrl = "https://avatars.githubusercontent.com/u/12345"
)

The enum now supports all four GitHub user types: User, Organization, Bot, and Mannequin.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• download.jetbrains.com
  • Triggering command: /usr/lib/jvm/temurin-17-jdk-amd64/bin/java /usr/lib/jvm/temurin-17-jdk-amd64/bin/java --add-opens=java.base/java.util=ALL-UNNAMED --add-opens=java.base/java.lang=ALL-UNNAMED --add-opens=java.base/java.lang.invoke=ALL-UNNAMED --add-opens=java.prefs/java.util.prefs=ALL-UNNAMED --add-exports=jdk.compiler/com.sun.tools.javac.api=ALL-UNNAMED --add-exports=jdk.compiler/com.sun.tools.javac.util=ALL-UNNAMED --add-opens=java.base/java.nio.charset=ALL-UNNAMED --add-opens=java.base/java.net=ALL-UNNAMED --add-opens=java.base/java.util.concurrent.atomic=ALL-UNNAMED -XX:MaxMetaspaceSize=384m -XX:+HeapDumpOnOutOfMemoryError -Xms256m -Xmx512m -Dfile.encoding=UTF-8 -Duser.country -Duser.language=en -Duser.variant -cp /home/REDACTED/.gradle/wrapper/dists/gradle-8.10.2-bin/a04bxjujx95o3nb99gddekhwo/gradle-8.10.2/lib/gradle-daemon-main-8.10.2.jar (dns block)

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Original prompt

I would like user type to also include a type for mannequin users, written Mannequin

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[Copilot]

Pull request overview

This PR adds support for the MANNEQUIN user type to the GitHubUserType enum, allowing the library to properly handle mannequin users in GitHub data.

• Added MANNEQUIN enum value with proper @SerialName("Mannequin") annotation
• Added test case to verify the new user type can be instantiated correctly

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
danger-kotlin-library/src/main/kotlin/systems/danger/kotlin/models/github/GitHub.kt	Added MANNEQUIN enum value to GitHubUserType with proper serialization annotation
danger-kotlin-library/src/test/kotlin/systems/danger/kotlin/models/github/GitHubParsingTests.kt	Added test case to verify mannequin user type functionality

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