Update tensorflow to 2.16.1 in requirements.txt

Change-Id: Ibadfc37bc127f05939336d267045615d3db12ace
Signed-off-by: Jonny Svärd <jonny.svaerd@arm.com>
diff --git a/requirements.txt b/requirements.txt
index 5b88d12..d4d4d03 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
 ethos-u-vela
 pillow
 pyelftools
-tensorflow==2.16
+tensorflow==2.16.1