Fix get_secret_scanning_scan_history to use direct API call

The method was using query_once which defaults to cursor-based
pagination. The scan-history endpoint returns a single JSON object
(not a paginated list), so pagination params were incorrect and HTTP
errors were silently swallowed.

Now uses _get directly so:
- No spurious per_page/before query params
- HTTP errors (e.g. 403) properly propagate to callers

Agent-Logs-Url: https://github.com/advanced-security/ghas-api-python-scripts/sessions/7fb48030-50b4-4f88-bce8-1e571af0e38b

Co-authored-by: felickz <1760475+felickz@users.noreply.github.com>

Author: Copilot

githubapi.py

@@ -545,9 +545,11 @@ def get_secret_scanning_scan_history(self, repo_nwo: str) -> dict:
         """Get secret scanning scan history for a single repository.
 
         Returns the raw JSON response from GET /repos/{owner}/{repo}/secret-scanning/scan-history.
+        Raises on HTTP errors so callers can handle them.
         """
-        result = self.query_once("repo", repo_nwo, "/secret-scanning/scan-history")
-        return result if result is not None else {}
+        url = self.construct_api_url("repo", repo_nwo, "/secret-scanning/scan-history", None, None)
+        response = self._get(url)
+        return response.json()
 
 
 def parse_date(date: str) -> datetime.datetime | None: