fix(File): Read the cached_filings input, not cached_results (#12)

This PR updates the `core.getInput` call to match the `action.yml`
(https://github.com/github/accessibility-scanner/blob/69cb82cdc3d9e37c418092e71af165108b31911c/.github/actions/file/action.yml#L14-L16),
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.

Author: smockle

.github/actions/file/src/index.ts

@@ -21,7 +21,7 @@ export default async function () {
   const repoWithOwner = core.getInput("repository", { required: true });
   const token = core.getInput("token", { required: true });
   const cachedFilings: (ResolvedFiling | RepeatedFiling)[] = JSON.parse(
-    core.getInput("cached_results", { required: false }) || "[]"
+    core.getInput("cached_filings", { required: false }) || "[]"
   );
   core.debug(`Input: 'findings: ${JSON.stringify(findings)}'`);
   core.debug(`Input: 'repository: ${repoWithOwner}'`);