chore(deps): upgrade to 1.23.4

[schultzp2020]

Description

Please explain the changes you made here.

Which issue(s) does this PR fix

• upgrade to 1.23.4 - https://github.com/backstage/backstage/releases/tag/v1.23.4

PR acceptance criteria

Please make sure that the following steps are complete:

• GitHub Actions are completed and successful
• Unit Tests are updated and passing
• E2E Tests are updated and passing
• Documentation is updated if necessary (requirement for new features)
• Add a screenshot if the change is UX/UI related

How to test changes / Special notes to the reviewer

[openshift-ci]

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[github-actions]

The image is available at: quay.io/janus-idp/backstage-showcase:pr-1051!

[nickboldt]

seems legit but I bet we need to bump the plugin versions again once they're rebuilt in https://github.com/janus-idp/backstage-plugins/ against Backstage 1.23.4?

[janus-idp]

backstage-showcase Tests on commit 2a1ca08 finished with errors.
View test log

[nickboldt]

janus-idp/backstage-plugins#1307 merged, waiting for rebase...

[github-actions]

The image is available at: quay.io/janus-idp/backstage-showcase:pr-1051!

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud

[github-actions]

The image is available at: quay.io/janus-idp/backstage-showcase:pr-1051!