Update schemaVersion in pdsc file (ARM-software#136)

Author: mansnils

ARM.CMSIS-NN.pdsc

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 
-<package schemaVersion="1.7.7" xmlns:xs="http://www.w3.org/2001/XMLSchema-instance" xs:noNamespaceSchemaLocation="https://raw.githubusercontent.com/Open-CMSIS-Pack/Open-CMSIS-Pack-Spec/v1.7.7/schema/PACK.xsd">
+<package schemaVersion="1.7.36" xmlns:xs="http://www.w3.org/2001/XMLSchema-instance" xs:noNamespaceSchemaLocation="https://raw.githubusercontent.com/Open-CMSIS-Pack/Open-CMSIS-Pack-Spec/v1.7.36/schema/PACK.xsd">
   <name>CMSIS-NN</name>
   <description>CMSIS NN software library of efficient neural network kernels</description>
   <vendor>ARM</vendor>