MLECO-4074: bump up version of armclang to 6.19

* issues identified with armclang 6.17 and 6.18
* updates in cmake for minimum version
* updates in release notes and documentation

Change-Id: Iffa711d9d95a509f5c07cd55f59a49bdcf3e9d6a
diff --git a/release_notes.txt b/release_notes.txt
index 7296739..76072d6 100644
--- a/release_notes.txt
+++ b/release_notes.txt
@@ -1,6 +1,7 @@
 Changes in 23.08
     * Support for 23.08 NPU components and dependencies (core-driver, core-platform, Vela 3.9.0, CMSIS, CMSIS-NN and TensorFlow Lite Micro).
     * Update Python package requirements for compatibility reasons.
+    * Increase minimum requirements of Armclang to 6.19
 
 Changes in 23.05
     * Support for 23.05 NPU components and dependencies (core-driver, core-platform, Vela 3.8.0, CMSIS, CMSIS-NN and TensorFlow Lite Micro).