MLBEDSW-3771: Updated to TF 2.4 flatbuffer schema

Updated tflite loader and mappings from tensorflow 2.3 to tensorflow 2.4

Signed-off-by: Tim Hall <tim.hall@arm.com>
Change-Id: I55884000ee139baf639bb0377008e0534f72fe94
diff --git a/setup.py b/setup.py
index c62944a..f67d42e 100644
--- a/setup.py
+++ b/setup.py
@@ -78,7 +78,7 @@
     packages=find_namespace_packages(include=["ethosu.*"]),
     python_requires="~=3.6",  # We support only 3.6+
     install_requires=[
-        "flatbuffers==1.11.0",
+        "flatbuffers==1.12.0",
         "numpy>=1.16.6",
         "numpy>=1.16.6,<1.19.4 ; platform_system=='Windows'",
         "lxml>=4.5.1",