v0.4.0-alpha.3

zenoh-rpc was requiring the version "=1.0.23" of the quote crate which,
somehow, forced Cargo to:

• bump pest_meta to the version "2.6.0",
• bump pest_generator to the version "2.5.6".

Unfortunately these crates are incompatible, eventually preventing us from
building Zenoh-Flow.

This release fixes this issue.