Update main documentation

main/footer.js

@@ -1,7 +1,7 @@
 function writeHeader() {
-    document.write('Version 1.14.5-dev19');
+    document.write('Version 1.14.5-dev21');
 };
 
 function writeFooter()  {
-    document.write('Generated on Wed Jul  5 2023 08:35:55 for CMSIS-DSP 1.14.5-dev19+g7f6c656. Copyright © 2022-2023 Arm Limited (or its affiliates). All rights reserved.');
+    document.write('Generated on Wed Jul 19 2023 13:09:05 for CMSIS-DSP 1.14.5-dev21+g60a8c88. Copyright © 2022-2023 Arm Limited (or its affiliates). All rights reserved.');
 };

version.js

@@ -1,6 +1,6 @@
 //--- list of versions ---
 const versions = {
-    "main": "1.14.5-dev19",
+    "main": "1.14.5-dev21",
     "latest": "1.14.4",
     "v1.14.3": "1.14.3",
     "v1.14.2": "1.14.2",