MLBEDSW-6425: Update to TensorFlow 2.8

Update the flatbuffers generated code to comply with TensorFlow 2.8

Signed-off-by: Rickard Bolin <rickard.bolin@arm.com>
Change-Id: Ia65325b88745e49dbafa803a38c0ea0e7d0478ba
diff --git a/ethosu/vela/tflite/BuiltinOperator.py b/ethosu/vela/tflite/BuiltinOperator.py
index 47ff6d0..5ddcf20 100644
--- a/ethosu/vela/tflite/BuiltinOperator.py
+++ b/ethosu/vela/tflite/BuiltinOperator.py
@@ -150,3 +150,9 @@
     ASSIGN_VARIABLE = 144
     BROADCAST_ARGS = 145
     RANDOM_STANDARD_NORMAL = 146
+    BUCKETIZE = 147
+    RANDOM_UNIFORM = 148
+    MULTINOMIAL = 149
+    GELU = 150
+    DYNAMIC_UPDATE_SLICE = 151
+