Update tracing-subscriber requirement from 0.2.1 to 0.3.1 (#283)

Updates the requirements on [tracing-subscriber](https://github.com/tokio-rs/tracing) to permit the latest version.
- [Release notes](https://github.com/tokio-rs/tracing/releases)
- [Commits](tokio-rs/tracing@tracing-subscriber-0.2.1...tracing-subscriber-0.3.1)

---
updated-dependencies:
- dependency-name: tracing-subscriber
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Cargo.toml

@@ -28,7 +28,7 @@ tracing = "^0.1"
 
 [dev-dependencies]
 criterion = "0.3"
-tracing-subscriber = "0.2.1"
+tracing-subscriber = { version = "0.3.1", features = [ "env-filter" ] }
 
 [workspace]
 members = [

topo/benches/simple_calls.rs

@@ -20,12 +20,12 @@ fn call(c: &mut Criterion) {
 fn call_topo_fns_to_depth(b: &mut criterion::Bencher, depth: &usize) {
     macro_rules! mk {
         (go $depth_spec:ident) => {
-            b.iter(|| topo::call(|| mk!(pass $depth_spec 0)));
+            b.iter(|| topo::call(|| mk!(pass $depth_spec 0)))
         };
         (pass $depth_spec:ident $call_depth:expr) => {
             topo::call(|| {
                 mk!(cur $depth_spec ($call_depth + 1));
-            });
+            })
         };
         (cur twelve $depth:expr) => {
             mk!(pass eleven $depth);