Merge branch 'sb/unpack-index-pack-buffer-resize'

Use a larger buffer size in the code paths to ingest pack stream.

* sb/unpack-index-pack-buffer-resize:
  index-pack, unpack-objects: increase input buffer from 4 KiB to 128 KiB

diff --cc builtin/index-pack.c
Simple merge

diff --cc builtin/unpack-objects.c
Simple merge