Fix: Incorrect CMSIS-NN url

Change-Id: Id6e7e735e8891b59533036a7d216033a3d26e1c6

Signed-off-by: Liam Barry <liam.barry@arm.com>
Change-Id: Ib471b1808252d64a08382e06e28936dcd5c636ab
diff --git a/scripts/py/dependency_urls.json b/scripts/py/dependency_urls.json
index 33a84f7..56ea403 100644
--- a/scripts/py/dependency_urls.json
+++ b/scripts/py/dependency_urls.json
@@ -1,7 +1,7 @@
 {
   "cmsis": "https://github.com/ARM-software/CMSIS_5/archive/a75f01746df18bb5b929dfb8dc6c9407fac3a0f3.zip",
   "cmsis-dsp": "https://github.com/ARM-software/CMSIS-DSP/archive/refs/tags/v1.15.0.zip",
-  "cmsis-nn": "https://github.com/ARM-software/CMSIS-NN/archive/refs/85164a811917770d7027a12a57ed3b469dac6537.zip",
+  "cmsis-nn": "https://github.com/ARM-software/CMSIS-NN/archive/85164a811917770d7027a12a57ed3b469dac6537.zip",
   "core-driver": "https://git.mlplatform.org/ml/ethos-u/ethos-u-core-driver.git/snapshot/ethos-u-core-driver-23.08.tar.gz",
   "core-platform": "https://git.mlplatform.org/ml/ethos-u/ethos-u-core-platform.git/snapshot/ethos-u-core-platform-23.08.tar.gz",
   "tensorflow": "https://github.com/tensorflow/tflite-micro/archive/568d181ccc1f60e49742fd43b7f97141ee8d45fc.zip"