release-please-action uses deprecated `actions/core` version, yielding warnings with every build

[easimon]

TL;DR

Github Actions deprecated the set-output command to set action outputs. Every action that depends on the node-js library actions/core uses this command under the hood to create outputs, and release-please-action is one of them. Every execution now looks similar to this:

Expected behavior

No warnings when running release-please-action.

Observed behavior

Every execution of release-please-action emits warnings like the ones above. The number of warnings is variable (as is the number of outputs created by release-please).

The action.yaml below emits one warning.

Action YAML

name: Release Please
on:
  push:

jobs:
  release-please:
    runs-on: ubuntu-22.04
    outputs:
      release_created: ${{ steps.release.outputs.release_created }}
    steps:
      - uses: GoogleCloudPlatform/release-please-action@v3.5.0
        id: release
        with:
          package-name: release-please-test
          release-type: simple

  release-please-output:
    runs-on: ubuntu-22.04
    needs:
      - release-please
    steps:
      - run: echo ${{ needs.release-please.outputs.release_created }}

Log output

See example workflow run at https://github.com/easimon/bug-reproducers/actions/runs/3265332340

Additional information

This action uses actions/core@1.6.0. To fix the issue, updating actions/core to at least 1.10.0 is required, which has been released only 18 days ago.
See Release Notes

I don't know if there are any incompatible changes between these two versions.

[easimon]

has been fixed with #638. Thanks!