chore: update team email address

Updates the email address used for the Penumbra Labs team in the cargo
manifest. There's only one point of update, because the crates all
reference the top-level workspace fields. Other crates outside the
protocol monorepo will need to be updated separately.

Cargo.toml

@@ -102,7 +102,7 @@ tag = true
 push = false
 
 [workspace.package]
-authors    = ["Penumbra Labs <team@penumbra.zone>"]
+authors    = ["Penumbra Labs <team@penumbralabs.xyz"]
 edition    = "2021"
 version    = "0.80.4"
 repository = "https://github.com/penumbra-zone/penumbra"