Bump pillow from 9.0.1 to 9.3.0 in /samples/ImageClassification

 * From dependabot

Signed-off-by: Mike Kelly <mike.kelly@arm.com>
Change-Id: Ibf4dc2a679b4d588f823b8b1f1d34f7d4a2125c5
diff --git a/samples/ImageClassification/requirements.txt b/samples/ImageClassification/requirements.txt
index 3f56a7b..34df416 100644
--- a/samples/ImageClassification/requirements.txt
+++ b/samples/ImageClassification/requirements.txt
@@ -1,7 +1,7 @@
 #
-# Copyright © 2021 Arm Ltd and Contributors. All rights reserved.
+# Copyright © 2021-2022 Arm Ltd and Contributors. All rights reserved.
 # SPDX-License-Identifier: MIT
 #
 numpy==1.22.0
-Pillow==9.0.1
+Pillow==9.3.0
 pybind11==2.6.2