Update Compensation Benchmark Sources

Updates the name and sort order of one or more existing benchmark sources in a single call. Every item in benchmarkSources must include a non-empty id and name; any item with the reserved name mercer (case-insensitive) is rejected because Mercer sources are managed separately. Use GET /api/v1/compensation/benchmarks/sources to obtain the current id values. Returns { "result": "success" } when all updates are applied.

OAuth Scopes: compensation_benchmarks.write