Updating Tensorflow to 2.9.0

Change-Id: Id5faecc7e348780237decf31d1195870264f32cc
diff --git a/requirements.txt b/requirements.txt
index 6f61d65..68ef056 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
 ethos-u-vela
 pillow
 pyelftools
-tensorflow==2.8.0
+tensorflow==2.9.0