chore: update author email addresses

Updates email address domain to the current Penumbra Labs email
settings, and adds a general team address to the authors list.

Author: conorsch

Cargo.toml

@@ -1,7 +1,7 @@
 [package]
 name = "tower-abci"
 version = "0.15.0"
-authors = ["Henry de Valence <hdevalence@penumbra.zone>"]
+authors = ["Penumbra Labs <team@penumbralabs.xyz>, Henry de Valence <hdevalence@penumbralabs.xyz"]
 edition = "2021"
 license = "MIT"
 description = "A `tower`-based interface to Tendermint's ABCI"