Update Grpc

gRPC, Netty, and BoringSSL are tightly coupled together. Incompatible version combinations will cause runtime failures. When updating gRPC, you must follow this procedure:

1. Browse the compatibility matrix at https://github.com/grpc/grpc-java/blob/master/SECURITY.md#netty to determine the correct Netty and BoringSSL (netty-tcnative-boringssl-static) versions for the target gRPC version.

2. Update the version properties in all of the following POM files:

   • pom.xml (root)
   • central/pom.xml
   • agent/shaded/core/pom.xml
   • agent/shaded/central-https-linux/pom.xml
   • agent/shaded/central-https-windows/pom.xml
   • agent/shaded/central-https-osx/pom.xml

3. All three versions (gRPC, Netty, BoringSSL) must be updated together — never update one without checking the others.

4. After modifying the POM files, grep the project for any other references to the old versions to ensure nothing was missed:

   grep -r "OLD_GRPC_VERSION" --include="pom.xml"
   grep -r "OLD_NETTY_VERSION" --include="pom.xml"
   grep -r "OLD_BORINGSSL_VERSION" --include="pom.xml"