Upgrade Gradle to 9.0.0 and resolve compatibility issues

[Copilot]

Upgrades Gradle from 8.3 to 9.0.0 and addresses breaking changes for Gradle 9.0+ compatibility.

Changes

• Gradle wrapper: 8.3 → 9.0.0
• bnd plugin: 6.4.0 → 7.1.0 (resolves removed getConvention() API)
• Test framework: Added explicit junit-platform-launcher dependency (Gradle 9.0 requirement)
• Build script: Fixed deprecated property assignment syntax in publishing block (groupId = group vs groupId group)
• CI workflows: Updated to JDK 17 (Gradle 9.0 runtime requirement; compilation target remains Java 11 via toolchain)

Notes

One deprecation warning persists from bnd plugin internals (Task.project access at execution time). This is a plugin issue tracked upstream, not user code.

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:

• www.graphql-java.com
  • Triggering command: /usr/lib/jvm/temurin-11-jdk-amd64/bin/java -Dorg.gradle.internal.worker.tmpdir=/home/REDACTED/work/graphql-java-extended-scalars/graphql-java-extended-scalars/build/tmp/test/work -Dorg.gradle.native=false @/home/REDACTED/.gradle/.tmp/gradle-worker-classpath1755932985856856068txt -Xmx512m -Dfile.encoding=UTF-8 -Duser.country -Duser.language=en -Duser.variant -ea worker.org.gradle.process.internal.worker.GradleWorkerMain 'Gradle Test Executor 3' (dns block)
  • Triggering command: /usr/lib/jvm/temurin-11-jdk-amd64/bin/java -Dorg.gradle.internal.worker.tmpdir=/home/REDACTED/work/graphql-java-extended-scalars/graphql-java-extended-scalars/build/tmp/test/work -Dorg.gradle.native=false @/home/REDACTED/.gradle/.tmp/gradle-worker-classpath17351168550198361924txt -Xmx512m -Dfile.encoding=UTF-8 -Duser.country -Duser.language=en -Duser.variant -ea worker.org.gradle.process.internal.worker.GradleWorkerMain 'Gradle Test Executor 3' (dns block)
  • Triggering command: /usr/lib/jvm/temurin-11-jdk-amd64/bin/java -Dorg.gradle.internal.worker.tmpdir=/home/REDACTED/work/graphql-java-extended-scalars/graphql-java-extended-scalars/build/tmp/test/work @/home/REDACTED/.gradle/.tmp/gradle-worker-classpath14025045871475477012txt -Xmx512m -Dfile.encoding=UTF-8 -Duser.country -Duser.language=en -Duser.variant -ea worker.org.gradle.process.internal.worker.GradleWorkerMain 'Gradle Test Executor 3' (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

Upgrade the project to use the latest Gradle version. This change involves updating the Gradle wrapper to the newest available version and ensuring compatibility with all dependencies and plugins. Specifically:

1. Upgrade the Gradle wrapper version to the latest stable release.
2. Test the build process to ensure all dependencies are compatible with the latest Gradle version.
3. Address any deprecation warnings and update configurations for any plugins or dependencies as necessary, aligning with Gradle's current guidelines.
4. Validate that tests and build processes work seamlessly with the new setup.

This pull request was created as a result of the following prompt from Copilot chat.

Upgrade the project to use the latest Gradle version. This change involves updating the Gradle wrapper to the newest available version and ensuring compatibility with all dependencies and plugins. Specifically:

1. Upgrade the Gradle wrapper version to the latest stable release.
2. Test the build process to ensure all dependencies are compatible with the latest Gradle version.
3. Address any deprecation warnings and update configurations for any plugins or dependencies as necessary, aligning with Gradle's current guidelines.
4. Validate that tests and build processes work seamlessly with the new setup.

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