[MINOR] Upgrade netty and grpc (#6100)

* Upgrade netty and grpc
* fix verification file
Signed-off-by: Simon Dudley <simon.dudley@consensys.net>

---------

Signed-off-by: Sally MacFarlane <macfarla.github@gmail.com>
Co-authored-by: Sally MacFarlane <macfarla.github@gmail.com>

Author: siladu

CHANGELOG.md

@@ -22,6 +22,11 @@
 
 ### Bug fixes
 
+- Upgrade netty to address CVE-2023-44487, CVE-2023-34462 [#6100](https://github.com/hyperledger/besu/pull/6100)
+- Upgrade grpc to address CVE-2023-32731, CVE-2023-33953, CVE-2023-44487, CVE-2023-4785 [#6100](https://github.com/hyperledger/besu/pull/6100)
+
+---
+
 ### Download Links
 
 ## 23.10.1