fix(bin/bench): rename 1-conn/10_000-1b-seq-resp to parallel (#1796)

The benchmark is using the default concurrency factor. By default `neqo-client`
runs up to `100` requests in parallel.

https://github.com/mozilla/neqo/blob/5dfe106669ccb695187511305c21b8e8a8775e91/neqo-bin/src/client/mod.rs#L151-L153

Thus the benchmark name is wrong, i.e. the requests are run in parallel and not
sequentially.

neqo-bin/benches/main.rs

@@ -33,7 +33,7 @@ fn transfer(c: &mut Criterion) {
             sample_size: Some(10),
         },
         Benchmark {
-            name: "1-conn/10_000-1b-seq-resp (aka. RPS)".to_string(),
+            name: "1-conn/10_000-parallel-1b-resp (aka. RPS)".to_string(),
             requests: vec![1; 10_000],
             sample_size: None,
         },