fix(release-please): remove release-as (#13)

## Description

*Please include a summary of the changes and the related issue.*

Closes #...

## What type of PR is this? (check all applicable)
- [ ] Bug Fix
- [ ] Feature
- [ ] Refactor
- [ ] Deprecation
- [ ] Breaking Change
- [ ] Documentation Update
- [ ] CI

## Checklist
- [ ] I have made corresponding changes to the documentation (`docs/`)
- [ ] I have made corresponding changes to the changelog
(`CHANGELOG.md`)

Author: DjordyKoert

.github/workflows/release.backport.yml

@@ -22,5 +22,4 @@ jobs:
           # for more options
           release-type: php
           versioning-strategy: always-bump-patch
-          release-as: 4.0.0
           target-branch: 4.x