Maintenance: Outdated action reference in `on-merge` workflow

[dreamorosi]

Summary

The on-merge workflow changes merged in #1125 left behind a couple of references to an older file name that cause the GitHub action to fail.

A PR should be opened to fix the issue.

Why is this needed?

Otherwise the action that is run on merge will fail.

Which area does this relate to?

Automation

Solution

Replace outdate references in workflow files.

Acknowledgment

• This request meets Lambda Powertools Tenets
• Should this be considered in other Lambda Powertools languages? i.e. TypeScript, Java

[github-actions]

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