Upgrade to rlimit 0.8.3, again.

Now that our MSRV is at 1.56, we can use the latest rlimit.

It has to be 0.8.3 (not "0.8"), since 0.8.2 has compatibility issues
with 1.56.

Cargo.lock

@@ -2563,9 +2563,9 @@ dependencies = [
 
 [[package]]
 name = "rlimit"
-version = "0.7.0"
+version = "0.8.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "347703a5ae47adf1e693144157be231dde38c72bd485925cae7407ad3e52480b"
+checksum = "f7278a1ec8bfd4a4e07515c589f5ff7b309a373f987393aef44813d9dcf87aa3"
 dependencies = [
  "libc",
 ]

crates/arti-testing/Cargo.toml

@@ -40,7 +40,7 @@ tracing = "0.1.18"
 notify = "4.0"
 pin-project = "1"
 rand = "0.8"
-rlimit = "0.7"
+rlimit = "0.8.3"
 serde = { version = "1.0.103", features = ["derive"] }
 tracing-subscriber = { version = "0.3.0", features = ["env-filter"] }
 tokio = { version = "1.7", features = ["signal", "macros"] }

crates/arti/Cargo.toml

@@ -39,7 +39,7 @@ futures = "0.3.14"
 tracing = "0.1.18"
 notify = "4.0"
 once_cell = { version = "1", optional = true }
-rlimit = "0.7"
+rlimit = "0.8.3"
 serde = { version = "1.0.103", features = ["derive"] }
 tracing-subscriber = { version = "0.3.0", features = ["env-filter"] }
 tokio-crate = { package = "tokio", version = "1.7", optional = true, features = ["signal"] }