chore: Backport #10, #11, #12 to v2

[smockle]

This PR backports #10, #11, and #12 from main to the v2 branch.

[Copilot]

Pull Request Overview

This PR backports commits #10, #11, and #12 from the main branch to v2, implementing fixes for shell command injection vulnerabilities and correcting input parameter references.

• Replaces echo with printf and adds -c flag to jq for safer shell command execution
• Fixes input parameter name from cached_results to cached_filings

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
action.yml	Updates shell command to use printf instead of echo and adds -c flag to jq for security improvements
.github/actions/file/src/index.ts	Corrects input parameter name from cached_results to cached_filings

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