Security maintenance release.
- Update
guzzlehttp/guzzle 7.9.1 → 7.15.1
- Update
guzzlehttp/psr7 2.7.0 → 2.13.0
Resolves the open Dependabot advisories (moderate) via composer.lock. Dependency-only change; no functional changes. Supersedes Dependabot PRs #14 and #15.