rfc3052: Remove authors field from Cargo manifests

Since RFC 3052 soft deprecated the authors field anyway, hiding it from
crates.io, docs.rs, and making Cargo not add it by default, and it is
not generally up to date/useful information, we should remove it from
crates in this repo.

Author: lf-

compiler/rustc/Cargo.toml

@@ -1,5 +1,4 @@
 [package]
-authors = ["The Rust Project Developers"]
 name = "rustc-main"
 version = "0.0.0"
 edition = '2018'

compiler/rustc_apfloat/Cargo.toml

@@ -1,5 +1,4 @@
 [package]
-authors = ["The Rust Project Developers"]
 name = "rustc_apfloat"
 version = "0.0.0"
 edition = "2018"

compiler/rustc_arena/Cargo.toml

@@ -1,5 +1,4 @@
 [package]
-authors = ["The Rust Project Developers"]
 name = "rustc_arena"
 version = "0.0.0"
 edition = "2018"

compiler/rustc_ast/Cargo.toml

@@ -1,5 +1,4 @@
 [package]
-authors = ["The Rust Project Developers"]
 name = "rustc_ast"
 version = "0.0.0"
 edition = "2018"

compiler/rustc_ast_lowering/Cargo.toml

@@ -1,5 +1,4 @@
 [package]
-authors = ["The Rust Project Developers"]
 name = "rustc_ast_lowering"
 version = "0.0.0"
 edition = "2018"

compiler/rustc_ast_passes/Cargo.toml

@@ -1,5 +1,4 @@
 [package]
-authors = ["The Rust Project Developers"]
 name = "rustc_ast_passes"
 version = "0.0.0"
 edition = "2018"

compiler/rustc_ast_pretty/Cargo.toml

@@ -1,5 +1,4 @@
 [package]
-authors = ["The Rust Project Developers"]
 name = "rustc_ast_pretty"
 version = "0.0.0"
 edition = "2018"

compiler/rustc_attr/Cargo.toml

@@ -1,5 +1,4 @@
 [package]
-authors = ["The Rust Project Developers"]
 name = "rustc_attr"
 version = "0.0.0"
 edition = "2018"

compiler/rustc_builtin_macros/Cargo.toml

@@ -1,5 +1,4 @@
 [package]
-authors = ["The Rust Project Developers"]
 name = "rustc_builtin_macros"
 version = "0.0.0"
 edition = "2018"

compiler/rustc_codegen_cranelift/Cargo.toml

@@ -1,7 +1,6 @@
 [package]
 name = "rustc_codegen_cranelift"
 version = "0.1.0"
-authors = ["bjorn3 <bjorn3@users.noreply.github.com>"]
 edition = "2018"
 
 [lib]