chore(deps): update actions/upload-artifact action to v6

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
actions/upload-artifact	action	major	v4 -> v6

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Release Notes

actions/upload-artifact (actions/upload-artifact)

v6

Compare Source

v5

Compare Source

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[claude]

PR Review: Update actions/upload-artifact to v6

Summary

✅ LGTM - This is a straightforward dependency update with no issues.

Analysis

What Changed:

• Updated actions/upload-artifact from v4 to v6 in the MCP-TEF integration tests workflow
• Hash updated to match v6.0.0 (already used in code-quality.yml)

Review Points:

✅ Consistency: The same v6.0.0 hash is already in use in code-quality.yml:47, making this change consistent across workflows

✅ Usage Pattern: The action usage (with name, path, and optional retention-days) is compatible with v6 - no breaking changes affect this implementation

✅ No Breaking Changes: v6 main changes (improved performance, artifact upload backend updates) do not require code changes for this use case

✅ Security: Using commit hash pins instead of tags is good practice

Recommendation: Approve and merge. This is a safe, automated dependency update that maintains consistency across the repository.