GHSA-xc85-4mqc-xgcx: FreeRDP before 3.32.2 Proxy Out-of-Bounds Write via Bitmap Cache v2 Capability

FreeRDP before 3.32.2 has an out-of-bounds write in the proxy because rdpreadbitmapcachev2capabilityset rejects only numCellCaches values above 5, yet the bitmap cache v2 cell array is later accessed at fixed indices 0 through 4. A client connecting to the proxy can declare fewer than five cell caches in its Confirm Active, causing heap corruption, heap data leakage to the backend, or a crash.