fix(File): Read the cached_filings input, not cached_results

[smockle]

This PR updates the core.getInput call to match the action.yml (

accessibility-scanner/.github/actions/file/action.yml

Lines 14 to 16 in 69cb82c

	cached_filings:
	description: "Cached filings from previous runs, as stringified JSON. Without this, duplicate issues may be filed."
	required: false

), so results from previous runs are now available to the File sub-action. This ensures duplicate issues aren’t filed when the workflow re-runs.

[Copilot]

Pull Request Overview

This PR fixes a bug where the File sub-action was reading the wrong input parameter name, preventing it from accessing cached results from previous workflow runs.

• Updated the core.getInput call to read cached_filings instead of cached_results to match the action.yml configuration
• This ensures duplicate issues aren't filed when workflows re-run by properly accessing cached filing data

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