Update Gradle publish workflow: switch to published event, use `mac… (#259)

<!-- Provide a brief summary of your changes -->

## Motivation and Context

Align release workflow with the normal build workflow

## Changes

Update Gradle publish workflow: switch to `published` event, use
`mac…os-latest-xlarge`, and configure `JAVA_OPTS`.

## Types of changes
<!-- What types of changes does your code introduce? Put an `x` in all
the boxes that apply: -->
- [x] Bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds functionality)
- [ ] Breaking change (fix or feature that would cause existing
functionality to change)
- [ ] Documentation update
- [x] CI update

## Checklist
<!-- Go over all the following points, and put an `x` in all the boxes
that apply. -->
- [ ] I have read the [MCP
Documentation](https://modelcontextprotocol.io)
- [ ] My code follows the repository's style guidelines
- [ ] New and existing tests pass locally
- [ ] I have added appropriate error handling
- [ ] I have added or updated documentation as needed

## Additional context
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-->

.github/workflows/gradle-publish.yml

@@ -13,8 +13,10 @@ on:
 
 jobs:
   build:
-    runs-on: macos-latest
+    runs-on: macos-latest-xlarge
     environment: release
+    env:
+      JAVA_OPTS: "-Xmx8g -Dfile.encoding=UTF-8 -Djava.awt.headless=true -Dkotlin.daemon.jvm.options=-Xmx6g"
 
     permissions:
       contents: write