update setup-localstack version

[cloutierMat]

Motivation

As we are approaching release v4, we are trying to run all pipelines against the latest image. I that noticed in the action we were not installing the right version of localstack. Probably not relevant as the image used is built with latest, but worth fixing nonetheless.

We were only testing against localstack version 3.2.0 due to the setup tools distname issue. localstack/plux/pull/27. The following log is repeated for all version of LocalStack in the Start LocalStack step in https://github.com/localstack/pulumi-local/actions/runs/11916531999/job/33209401793.

Collecting localstack
  Downloading localstack-3.8.0.tar.gz (5.7 kB)
  Preparing metadata (setup.py): started
  Preparing metadata (setup.py): finished with status 'done'
Collecting localstack-ext==3.8.0
  Downloading localstack_ext-3.8.0.tar.gz (7.8 MB)
     ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 7.8/7.8 MB 96.0 MB/s eta 0:00:00
  Installing build dependencies: started
  Installing build dependencies: finished with status 'done'
  Getting requirements to build wheel: started
  Getting requirements to build wheel: finished with status 'done'
  Preparing metadata (pyproject.toml): started
  Preparing metadata (pyproject.toml): finished with status 'done'
  WARNING: Generating metadata for package localstack-ext produced metadata for project name unknown. Fix your #egg=localstack-ext fragments.
Discarding https://files.pythonhosted.org/packages/38/aa/1a7e1f54caf844dbc51[185](https://github.com/localstack/pulumi-local/actions/runs/11916531999/job/33209401793#step:3:187)a95af145c804ec0457f9202241babc865d3eb9/localstack_ext-3.8.0.tar.gz#sha256=fd16779a199f462577dd7f7cd7a52536ad09f10efc649c1c150de62c541c7690 (from https://pypi.org/simple/localstack-ext/) (requires-python:>=3.8): Requested unknown from https://files.pythonhosted.org/packages/38/aa/1a7e1f54caf844dbc51185a95af145c804ec0457f9202241babc865d3eb9/localstack_ext-3.8.0.tar.gz#sha256=fd16779a199f462577dd7f7cd7a52536ad09f10efc649c1c150de62c541c7690 (from localstack) has inconsistent name: filename has 'localstack-ext', but metadata has 'unknown'

And the docker start showing

     __                     _______ __             __
    / /   ____  _________ _/ / ___// /_____ ______/ /__
   / /   / __ \/ ___/ __ `/ /\__ \/ __/ __ `/ ___/ //_/
  / /___/ /_/ / /__/ /_/ / /___/ / /_/ /_/ / /__/ ,<
 /_____/\____/\___/\__,_/_//____/\__/\__,_/\___/_/|_|

 💻 LocalStack CLI 3.2.0
 👤 Profile: default