chore: Bump backstage chart version to fix the release workflow

[rm3l]

Description of the change

Follow-up to #177

Which issue(s) does this PR fix or relate to

• https://issues.redhat.com/browse/RHIDP-7469

How to test changes / Special notes to the reviewer

Checklist

• For each Chart updated, version bumped in the corresponding Chart.yaml according to Semantic Versioning.
• For each Chart updated, variables are documented in the values.yaml and added to the corresponding README.md. The pre-commit utility can be used to generate the necessary content. Use pre-commit run -a to apply changes. The pre-commit Workflow will do this automatically for you if needed.
• JSON Schema template updated and re-generated the raw schema via the pre-commit hook.
• Tests pass using the Chart Testing tool and the ct lint command.
• If you updated the orchestrator-infra chart, make sure the versions of the Knative CRDs are aligned with the versions of the CRDs installed by the OpenShift Serverless operators declared in the values.yaml file. See Installing Knative Eventing and Knative Serving CRDs for more details.

Summary by Sourcery

Chores:

• Update charts/backstage/Chart.yaml version from 4.2.12 to 4.2.13

[sourcery-ai]

Reviewer's Guide

This pull request updates the Backstage Helm chart by incrementing its semantic version to address the release workflow issue.

File-Level Changes

Change	Details	Files
Version bump for Backstage chart	Updated version from 4.2.12 to 4.2.13 in Chart.yaml	charts/backstage/Chart.yaml

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[sourcery-ai]

Hey @rm3l - I've reviewed your changes and they look great!

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[github-actions]

⚠️ Files changed after running the pre-commit hooks

Those changes should have been pushed automatically to your PR branch.

NOTE: If the PR checks are stuck after this additional commit, manually close the PR and immediately reopen it to trigger the checks again.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud