Updated 'Update community pull requests spreadsheet' action test

[MisRob]

This tests that the spreadsheet gets updated when the action call is

name: Update community pull requests spreadsheet
on: [pull_request_target, issue_comment]

jobs:
  call-update-spreadsheet:
    uses: learningequality/.github/.github/workflows/update-pr-spreadsheet.yml@main
    secrets:
      CONTRIBUTIONS_SPREADSHEET_ID: ${{ secrets.CONTRIBUTIONS_SPREADSHEET_ID }}
      CONTRIBUTIONS_SHEET_NAME: ${{ secrets.CONTRIBUTIONS_SHEET_NAME }}
      GH_UPLOADER_GCP_SA_CREDENTIALS: ${{ secrets.GH_UPLOADER_GCP_SA_CREDENTIALS }}

(pushed directly to main before opening this pr)

[MisRob]

All good!