Only show use-pro deprecation message on top action input

[dominikschubert]

Motivation

Fixes #66

The use-pro deprecation message was shown even when users of the action didn't explicitly set the input, which was not the intended behavior.

Situation	Image used	use-pro deprecation message shown?
User omits use-pro	localstack/localstack-pro	no (before this PR this was also unintentionally yes)
User sets use-pro: true	localstack/localstack-pro	yes
User sets use-pro: false	localstack/localstack	yes

Root cause:

setup-localstack/action.yml

Line 122 in 2e0e140

"use-pro": ${{ toJSON(inputs.use-pro) }},

In the "sub"-action, the value will always be set, so that always triggered the deprecation message.

Changes

• Deprecation message for use-pro should now only be displayed when a user explicitly set it.

[github-actions]

The ephemeral instance for the application preview has been shut down

[joe4dev]

Will the deprecation warning be shown when use-pro is set explicitly, now that the deprecation message is removed?

[dominikschubert]

Will the deprecation warning be shown when use-pro is set explicitly, now that the deprecation message is removed?

Yes. The deprecation message is still available here:

setup-localstack/action.yml

Line 22 in 2e0e140

deprecationMessage: 'use-pro is deprecated and will be removed in a future release. The pro image is now the default.'