Add v5.4.0 package updates

[onesignal-deploy]

Release v5.4.0

🚀 Features

• feat(ci): close stale user-api-updates PRs before fan-out
• feat: add flat create-notification doc examples via vendor extension

🐛 Bug Fixes

• fix(ruby): remove redundant gem build step from release workflow
• fix(ci): tolerate gh pr close failures during stale PR cleanup
• fix: Rust consumer imports, Python model imports, Java modelPackage in API docs
• fix(ci): drift-mode rerun safety + pre-release range matching

📚 Docs

• docs: point partial-release caveat at SDK-4396 (cd.yml scope filter)

🔧 Internal

• build(release): bump package versions
• test(ruby): use string outer / symbol inner keys for result.content
• build(ruby): sync release workflow fix
• ci: generate real release notes in downstream PR bodies
• ci: correct release-notes anchor + warn on compareCommits truncation
• ci: add script/bump-version helper
• ci: auto-populate root release PR body via sdk-shared/create-release.yml
• ci: add one-click release orchestrator via sdk-shared/prep-release.yml
• ci: unstage devdist's pre-staged outputs deletions before chore commit
• ci: delegate release version math to node-semver CLI
• ci: enforce lockstep versioning across all client libraries
• ci: add partial-release label bypass + document per-language hotfix flow
• ci: gate release workflow on script/test- matrix
• ci: pin release test matrix checkouts to rel/
• ci: cut root GitHub Release on every release PR merge
• ci: anchor downstream-links version on commit message, not api.json
• ci: harden downstream-links gate, reconcile bare-version tags, make re-runs idempotent
• ci: auto-transition Linear tickets to Deployed on release
• ci: tighten lint-pr-title.yml to align with sdk-shared conventions
• ci: scope cd.yml fan-out to changed outputs// trees
• ci: address PR #364 review feedback
• ci: support drift-preserving releases (per-library version bumps)
• build: sync generated SDKs and DefaultApi reference docs
• build: refresh DefaultApi.md for Java, Python, and Rust

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Generated from OneSignal/api-client-libraries@bc71af6...8a77f63.

[sherwinski]

Closing in advance of upcoming api-client-libraries pipeline updates (#367, #369) so the next downstream fan-out exercises the new behavior on a clean slate. The next push to upstream main will reopen user-api-updates here with a per-language path-relevance-filtered release-notes body and (where applicable) a docs: commit prefix.