fix #187 via a dependency upgrade

I did a full `cargo upgrade` and fixed what it broke:

*   a couple things for the latest protobuf 3.0 alphas
    (note alphas don't promise API stability)
*   new minimum supported Rust version

This should have some other nice effects: parking_lot now uses inline
assembler, tokio has gotten faster, etc.

server/Cargo.toml

@@ -44,7 +44,7 @@ memchr = "2.0.2"
 mylog = { git = "https://github.com/scottlamb/mylog" }
 nix = "0.23.0"
 nom = "7.0.0"
-parking_lot = { version = "0.11.1", features = [] }
+parking_lot = "0.12.0"
 password-hash = "0.3.2"
 protobuf = "3.0.0-alpha.1"
 reffers = "0.6.0"

server/base/Cargo.toml

@@ -18,7 +18,7 @@ futures = "0.3"
 lazy_static = "1.0"
 libc = "0.2"
 log = "0.4"
-parking_lot = { version = "0.11.1", features = [] }
+parking_lot = "0.12.0"
 nom = "7.0.0"
 serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0"

server/db/Cargo.toml

@@ -31,7 +31,7 @@ mylog = { git = "https://github.com/scottlamb/mylog" }
 nix = "0.23.0"
 num-rational = { version = "0.4.0", default-features = false, features = ["std"] }
 odds = { version = "0.4.0", features = ["std-vec"] }
-parking_lot = { version = "0.11.1", features = [] }
+parking_lot = "0.12.0"
 pretty-hex = "0.2.1"
 protobuf = "3.0.0-alpha.1"
 ring = "0.16.2"
@@ -49,4 +49,4 @@ uuid = { version = "0.8", features = ["serde", "std", "v4"] }
 itertools = "0.10.0"
 
 [build-dependencies]
-protobuf-codegen-pure = "3.0.0-alpha.1"
+protobuf-codegen = "3.0.0-alpha.1"

server/db/build.rs

@@ -3,13 +3,11 @@
 // SPDX-License-Identifier: GPL-v3.0-or-later WITH GPL-3.0-linking-exception.
 
 fn main() -> Result<(), Box<dyn std::error::Error>> {
-    Ok(protobuf_codegen_pure::Codegen::new()
+    Ok(protobuf_codegen::Codegen::new()
+        .pure()
         .out_dir(std::env::var("OUT_DIR")?)
         .inputs(&["proto/schema.proto"])
         .include("proto")
-        .customize(protobuf_codegen_pure::Customize {
-            gen_mod_rs: Some(true),
-            ..Default::default()
-        })
+        .customize(protobuf_codegen::Customize::default().gen_mod_rs(true))
         .run()?)
 }