[BUG] Fix ambiguous Node type reference in build.gradle

[revijay]

Description

Fixes the ambiguous Node type reference in the root build.gradle.

Some Gradle environments may resolve Node to org.gradle.execution.plan.Node, causing a ClassCastException during Gradle execution. This change explicitly imports groovy.util.Node so the intended type is always used.

Related Issues

Resolves #19247

Check List

• Functionality includes testing.
• API changes companion pull request created, if applicable.
• Public documentation issue/PR created, if applicable.

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[github-actions]

❌ Gradle check result for 5125243: FAILURE

Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green. Is the failure a flaky test unrelated to your change?

[revijay]

❌ Gradle check result for 5125243: FAILURE

Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green. Is the failure a flaky test unrelated to your change?

I looked into the failure. It appears to be unrelated to this change.

The failure is in Netty4HttpRequestSizeLimitIT:

• java.lang.AssertionError: Failed to get all expected responses: 150 left
• SpanData validation failed for validator AllSpansAreEndedProperly

The Jenkins output indicates this test has been failing for the past 26 builds (Since Failed#82329), so it doesn't appear to have been introduced by this PR.

My change only updates the build.gradle import and does not touch the HTTP or Netty request handling code. Could a maintainer please confirm whether this is a known flaky/pre-existing CI failure?

[github-actions]

❌ Gradle check result for 5125243: FAILURE

Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green. Is the failure a flaky test unrelated to your change?

[github-actions]

✅ Gradle check result for c3a9f68: SUCCESS

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 71.45%. Comparing base (03a4de3) to head (c3a9f68).

Additional details and impacted files

@@             Coverage Diff              @@
##               main   #22514      +/-   ##
============================================
+ Coverage     71.42%   71.45%   +0.02%     
- Complexity    76786    76849      +63     
============================================
  Files          6148     6148              
  Lines        357980   357980              
  Branches      52177    52177              
============================================
+ Hits         255689   255785      +96     
+ Misses        81937    81857      -80     
+ Partials      20354    20338      -16     

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