This is needed to update protobuf. Version 1.33 breaks in Go 1.16 with
the following error: "//go:build comment without // +build comment".

Distribution was updated from buster (10) to bookworm (12).
protoc was updated from v3.6.1 to v3.21.12.

Fix the build:
go mod tidy
sed 's@\<lsat\>@l402@g' -i `git grep -l -w aperture/lsat`
make rpc

git mv ./cmd/loop/lsat.go ./cmd/loop/l402.go
sed 's@lsat@l402@g' -i `git grep -l lsat`
sed 's@Lsat@L402@g' -i `git grep -l Lsat`
sed 's@LSAT@L402@g' -i `git grep -l LSAT`
make rpc

Updated release_notes.md.

The flags were re-added in hidden mode so that users who specified them
could start the daemon after upgrading. If a flag is used, a deprecation
warning is printed.

Updated release_notes.md.

Provide backward compatibility for clients using this API endpoint.

This is needed not to break existing client binaries, e.g. `loop listauth`,
Terminal Web, RTL.

The API should be removed in a couple of releases. For now, GetLsatTokens
just prints a warning message about the API being deprecated and that the
client binary should be updated, and calls GetL402Tokens API, as a wrapper.

Type LsatToken used by GetLsatTokens in the past was renamed to L402Token,
but this does not affect binary encoding, so type L402Token can be used
(as part of TokensResponse) without breaking backward compatibility.

Updated release_notes.md.

See lightninglabs#730 (comment)