Move action runtime to Node.js 24

[Copilot]

The action emits a deprecation warning because it runs on Node.js 20. This change updates the runtime to the current supported Node.js version.

• Action runtime
  • Switch the action metadata to Node.js 24.

runs:
  using: 'node24'
  main: 'lib/index.js'

[rumblefrog]

@copilot

Error: System.ArgumentOutOfRangeException: Specified argument was out of the range of valid values. (Parameter ''using: node22' is not supported, use 'docker', 'node12', 'node16', 'node20' or 'node24' instead.')
at GitHub.Runner.Worker.ActionManifestManagerLegacy.ConvertRuns(IExecutionContext executionContext, TemplateContext templateContext, TemplateToken inputsToken, String fileRelativePath, MappingToken outputs)
at GitHub.Runner.Worker.ActionManifestManagerLegacy.Load(IExecutionContext executionContext, String manifestFile)
Error: Failed to load /home/runner/work/setup-sp/setup-sp/./action.yml

[Copilot]

@copilot

Error: System.ArgumentOutOfRangeException: Specified argument was out of the range of valid values. (Parameter ''using: node22' is not supported, use 'docker', 'node12', 'node16', 'node20...

Updated action metadata to use the supported node24 runtime; commit 2deb360 addresses the runner error.