Rework Cargo.toml dependencies (#3322)

* Use workspace variables from cargo, coming with rustc
[1.64](https://github.com/rust-lang/rust/blob/master/RELEASES.md#version-1640-2022-09-22)

See
https://doc.rust-lang.org/nightly/cargo/reference/workspaces.html#the-package-table
and
https://doc.rust-lang.org/nightly/cargo/reference/workspaces.html#the-dependencies-table
sections.

Now, all dependencies in all non-root `Cargo.toml` files are defined as 
```
clap.workspace = true
```

sometimes, when extra features are needed, as 
```
bytes = {workspace = true, features = ['serde'] }
```

With the actual declarations (with shared features and version
numbers/file paths/etc.) in the root Cargo.toml.
Features are additive:

https://doc.rust-lang.org/nightly/cargo/reference/specifying-dependencies.html#inheriting-a-dependency-from-a-workspace

* Uses the mechanism above to set common, 2021, edition and license across the
workspace

* Mechanically bumps a few dependencies

* Updates hakari format, as it suggested:
```
work/neon/neon kb/cargo-templated ❯ cargo hakari generate
info: no changes detected
info: new hakari format version available: 3 (current: 2)
(add or update `dep-format-version = "3"` in hakari.toml, then run `cargo hakari generate && cargo hakari manage-deps`)
```

proxy/Cargo.toml

@@ -1,58 +1,58 @@
 [package]
 name = "proxy"
 version = "0.1.0"
-edition = "2021"
-license = "Apache-2.0"
+edition.workspace = true
+license.workspace = true
 
 [dependencies]
-anyhow = "1.0"
-atty = "0.2.14"
-base64 = "0.13.0"
-bstr = "1.0"
-bytes = { version = "1.0.1", features = ['serde'] }
-clap = "4.0"
-futures = "0.3.13"
-git-version = "0.3.5"
-hashbrown = "0.12"
-hex = "0.4.3"
-hmac = "0.12.1"
-hyper = "0.14"
-hyper-tungstenite = "0.8.1"
-itertools = "0.10.3"
-md5 = "0.7.0"
-once_cell = "1.13.0"
-parking_lot = "0.12"
-pin-project-lite = "0.2.7"
-rand = "0.8.3"
-regex = "1.4.5"
-reqwest = { version = "0.11", default-features = false, features = [ "json", "rustls-tls" ] }
-routerify = "3"
-rustls = "0.20.0"
-rustls-pemfile = "1"
-scopeguard = "1.1.0"
-serde = "1"
-serde_json = "1"
-sha2 = "0.10.2"
-socket2 = "0.4.4"
-thiserror = "1.0.30"
-tokio = { version = "1.17", features = ["macros"] }
-tokio-postgres = { git = "https://github.com/neondatabase/rust-postgres.git", rev="43e6db254a97fdecbce33d8bc0890accfd74495e" }
-tokio-rustls = "0.23.0"
-tls-listener = { version = "0.5.1", features = ["rustls", "hyper-h1"] }
-tracing = "0.1.36"
-tracing-subscriber = { version = "0.3", features = ["env-filter"] }
-url = "2.2.2"
-uuid = { version = "1.2", features = ["v4", "serde"] }
-webpki-roots = "0.22.5"
-x509-parser = "0.14"
+anyhow.workspace = true
+atty.workspace = true
+base64.workspace = true
+bstr.workspace = true
+bytes = {workspace = true, features = ['serde'] }
+clap.workspace = true
+futures.workspace = true
+git-version.workspace = true
+hashbrown.workspace = true
+hex.workspace = true
+hmac.workspace = true
+hyper.workspace = true
+hyper-tungstenite.workspace = true
+itertools.workspace = true
+md5.workspace = true
+once_cell.workspace = true
+parking_lot.workspace = true
+pin-project-lite.workspace = true
+rand.workspace = true
+regex.workspace = true
+reqwest = { workspace = true, features = [ "json" ] }
+routerify.workspace = true
+rustls.workspace = true
+rustls-pemfile.workspace = true
+scopeguard.workspace = true
+serde.workspace = true
+serde_json.workspace = true
+sha2.workspace = true
+socket2.workspace = true
+thiserror.workspace = true
+tokio.workspace = true
+tokio-postgres.workspace = true
+tokio-rustls.workspace = true
+tls-listener.workspace = true
+tracing.workspace = true
+tracing-subscriber.workspace = true
+url.workspace = true
+uuid.workspace = true
+webpki-roots.workspace = true
+x509-parser.workspace = true
+metrics.workspace = true
+pq_proto.workspace = true
+utils.workspace = true
 
-metrics = { path = "../libs/metrics" }
-pq_proto = { path = "../libs/pq_proto" }
-utils = { path = "../libs/utils" }
-workspace_hack = { version = "0.1", path = "../workspace_hack" }
+workspace_hack.workspace = true
 
 [dev-dependencies]
-async-trait = "0.1"
-rcgen = "0.10"
-rstest = "0.15"
-tokio-postgres-rustls = "0.9.0"
+async-trait.workspace = true
+rcgen.workspace = true
+rstest.workspace = true
+tokio-postgres-rustls.workspace = true