actions/create-and-merge-pull-request is failing when pull request exists already

[neilime]

Describe the bug

When using hoverkraft-tech/ci-github-common/actions/create-and-merge-pull-request, if the a pull request exist already, it sometimes fails: Error: Cannot read properties of undefined (reading 'number')

There is a flaw in the action peter-evans/create-pull-request: https://github.com/peter-evans/create-pull-request/blob/25575a12f382fb9c68692ffce1174138b61417d7/src/github-helper.ts#L123

To Reproduce

Create a pull request with the proper branch name, the call the hoverkraft-tech/ci-github-common/actions/create-and-merge-pull-request

Expected behavior

When this case occurs it should retry to create the pull request

Screenshots

Run peter-evans/create-pull-request@v6.0.0
  with:
    token: ***
    signoff: true
    base: main
    delete-branch: true
    branch: feat/deploy-www-pr-751
    title: feat(www): deploy 3.13.0-pr-751-e7b1d433 to review-apps
    body: Deploy 3.13.0-pr-751-e7b1d433 to review-apps
    commit-message: feat(www): deploy 3.13.0-pr-751-e7b1d433 to review-apps"
  
  [skip ci]
  
    author: github-actions[bot] <41898[28](https://github.com/aircorsica/argo-app-of-the-apps/actions/runs/8830909931/job/24245047467#step:9:33)2+github-actions[bot]@users.noreply.github.com>
    committer: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
    draft: false
Prepare git configuration
Determining the base and head repositories
Pull request branch target repository set to aircorsica/argo-app-of-the-apps
Configuring credential for HTTPS authentication
Checking the base repository state
Pull request branch to create or update set to 'feat/deploy-www-pr-751'
Configuring the committer and author
Create or update the pull request branch
Pushing pull request branch to 'origin/feat/deploy-www-pr-7[51](https://github.com/aircorsica/argo-app-of-the-apps/actions/runs/8830909931/job/24245047467#step:9:59)'
Create or update the pull request
Restore git configuration*
  Attempting creation of pull request
  A pull request already exists for aircorsica:feat/deploy-www-pr-751
  Fetching existing pull request
  Attempting update of pull request
  Error: Cannot read properties of undefined (reading 'number')