fix(deps): bump Backstage to 1.54.6

[GabDug]

🚨 Proposed changes

Upgrade Backstage from 1.48.3 to 1.54.6.

No code changes. Mostly done for the 1.53+ improvement for config schemas: they are transformed to JSON Schema at package time (instead of every boot).

⚙️ Types of changes

What types of changes does your code introduce? Put an x in the boxes that apply

• New feature (non-breaking change which adds functionality)
• Bugfix (non-breaking change which fixes an issue)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation Update (if none of the other choices apply)
• Refactor

Summary by CodeRabbit

• Chores
  • Updated the application and package versions to newer Backstage releases.
  • Refreshed development tooling and runtime components across the project.
  • No user-facing functionality or public APIs were changed.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 4cf957e3-3fa7-413a-8749-a38a12cef544

📥 Commits

Reviewing files that changed from the base of the PR and between bf4b1f8 and 929bb91.

⛔ Files ignored due to path filters (1)

• yarn.lock is excluded by !**/yarn.lock, !**/*.lock

📒 Files selected for processing (5)

• backstage.json
• package.json
• packages/dev-sandbox/package.json
• packages/gitlab-backend/package.json
• packages/gitlab/package.json

Included review availability: Your plan provides up to 2 included reviews per hour; 1 remains after this review.

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📝 Walkthrough

Walkthrough

The update raises the Backstage workspace version and updates Backstage runtime and development dependency ranges in the root, dev-sandbox, GitLab backend, and GitLab package manifests.

Changes

Backstage dependency alignment

Layer / File(s)	Summary
Workspace release metadata backstage.json, package.json	The Backstage workspace version and root CLI tooling versions were updated.
Package dependency ranges packages/dev-sandbox/package.json, packages/gitlab-backend/package.json, packages/gitlab/package.json	Backstage runtime and development dependency ranges were updated across the dev-sandbox, GitLab backend, and GitLab packages.

Estimated code review effort: 2 (Simple) | ~10 minutes

Merge Risk: ⚪ Minimal · up to 929bb

This PR updates Backstage and related package versions without introducing code or configuration behavior changes; no actionable merge-blocking risk remains beyond normal checks and review.

Suggested reviewers: scorsi

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely identifies the Backstage dependency upgrade to version 1.54.6.
Description check	✅ Passed	The description explains the upgrade scope, the Backstage config schema improvement, and the absence of source code changes. It also marks the applicable change type. The required template sections ar…
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

Full details: Description check

Explanation

The description explains the upgrade scope, the Backstage config schema improvement, and the absence of source code changes. It also marks the applicable change type. The required template sections are present and sufficiently complete.

Full details: Docstring Coverage

Explanation

No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0 files. (5 skipped: 5 unsupported.)

✨ Finishing Touches 💡 1

🛠️ Fix failing CI checks 💡

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests

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