Fixed the v1.7.0 Docker image crashing with SIGILL (exit code 132) on x86 CPUs that support AVX but not AVX2 (e.g. Sandy Bridge / Ivy Bridge era). The ``faiss-cpu`` 1.14.2 wheels dropped the runtime CPU dispatch that 1.13.x shipped (separate generic/AVX2/AVX512 builds) and ship a single ``libfaiss.so`` compiled with AVX2 instructions, so importing faiss at app start-up executed an illegal instruction on AVX-only CPUs. ``faiss-cpu`` is now pinned to the 1.13.x series until upstream wheels restore a non-AVX2 fallback (reported upstream as facebookresearch/faiss#5296; lifting the pin is tracked in #4499).
