chore(tests): bump guzzle to ^7.9 in php test fixtures

[rustatian]

guzzle ^6.5 has no patched release for the open advisories (fix requires >= 7.12.1), so Dependabot security updates always fail to resolve. Bump to ^7.9 and relock (guzzle 7.14.2, psr7 2.12.5). composer audit is clean.

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[Copilot]

Pull request overview

Updates the PHP test fixture dependencies to move off Guzzle 6.x (which can’t resolve current security advisories) and onto the Guzzle 7.x line, with an updated lockfile to reflect the new dependency graph.

Changes:

• Bump guzzlehttp/guzzle requirement in the PHP test fixture composer.json to the 7.x range.
• Regenerate composer.lock, updating Guzzle to 7.14.2 and associated transitive dependencies (e.g., guzzlehttp/psr7 2.x, psr/http-message 2.0).

Reviewed changes

Copilot reviewed 1 out of 2 changed files in this pull request and generated 1 comment.

File	Description
tests/php_test_files/composer.json	Updates the test fixture’s declared Guzzle version constraint to 7.x.
tests/php_test_files/composer.lock	Refreshes the lockfile to the new resolved dependency set (Guzzle 7.14.2 and related updates).

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