chore(deps): update rust crate protobuf-codegen to v3.7.1

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
protobuf-codegen	build-dependencies	minor	3.5.0 -> 3.7.1

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Release Notes

stepancheg/rust-protobuf (protobuf-codegen)

v3.7.1

Compare Source

• protoc-gen-rust renamed to protoc-gen-rs. protoc --rust_out= no longer works with latest Google protobuf,
  they are working on official protobuf support for Rust.
• Do not detect nightly in protobuf crate (no longer needed)
• Repeated fields in constants

v3.6.0

Compare Source

• Fix text format parsing of non-ASCII

v3.5.1

Compare Source

• Remove deprecated box_pointers lint

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