build: bump exif_stripper to 0.1.2

0.1.2 handles gridded HEIC photos (as iPhones write them), PNG files
with data after IEND and TIFF files, and bounds HEIC parsing by the
input size. Add tests for these files.

mix.exs

@@ -205,7 +205,7 @@ defmodule Pleroma.Mixfile do
       {:majic, "~> 1.2"},
       {:open_api_spex, "~> 3.22"},
       {:ecto_psql_extras, "~> 0.8"},
-      {:exif_stripper, "~> 0.1.1"},
+      {:exif_stripper, "~> 0.1.2"},
       {:vix, "~> 0.36"},
       {:elixir_make, "~> 0.7.8", override: true},
       {:blurhash, "~> 0.1.0", hex: :rinpatch_blurhash},