multi: bump Go version

Bump all build go versions to v1.21.0
Bump the minimum build package version to v1.19.0

Debian "buster" is not longer supported. Security updates have been
discontinued since June 30th 2022. We will build using the latest
version, "bookworm".

lnrpc/Dockerfile

@@ -1,9 +1,9 @@
-FROM golang:1.20.4-buster
+FROM golang:1.21.0-bookworm
 
 RUN apt-get update && apt-get install -y \
   git \
-  protobuf-compiler='3.6.1*' \
-  clang-format='1:7.0*'
+  protobuf-compiler='3.21.12*' \
+  clang-format='1:14.0*'
 
 # We don't want any default values for these variables to make sure they're
 # explicitly provided by parsing the go.mod file. Otherwise we might forget to