fix(test): match watchkeeper action path to the rac-core repo rename [roadmap:v0.22.2]

The reusable watchkeeper workflow references the action as
itsthelore/rac-core@main since the v0.22.2 repository rename, but the
reusable-workflow test still matched the old requirements-as-code path
in `uses:` and raised StopIteration. Match on rac-core. The frozen PyPI
package name (pip install, SBOM, version description) is unchanged.

Signed-off-by: Tom Ballard <tom@armytage.co>

Author: tcballard

tests/test_watchkeeper.py

@@ -251,7 +251,7 @@ def test_reusable_workflow_passes_inputs_through():
     call_inputs = workflow[True]["workflow_call"]["inputs"]
     assert set(call_inputs) == {"path", "base", "fail-on", "annotate", "rac-version"}
     job = workflow["jobs"]["watchkeeper"]
-    action_step = next(s for s in job["steps"] if "requirements-as-code" in s.get("uses", ""))
+    action_step = next(s for s in job["steps"] if "rac-core" in s.get("uses", ""))
     assert set(action_step["with"]) == set(call_inputs)
     checkout = next(s for s in job["steps"] if "checkout" in s.get("uses", ""))
     assert checkout["with"]["fetch-depth"] == 0