Remove mimalloc override feature and use v3 (#497)

```
 v2 + override
   - 2094.266335/s p(95)=44.09ms p(99.9)=70.08ms
   - 2101.162308/s p(95)=44.37ms p(99.9)=70.32ms
 v2
   - 2107.037059/s p(95)=44.2ms  p(99.9)=71.08ms
   - 2099.354574/s p(95)=43.72ms p(99.9)=68ms
 v3
   - 2122.790698/s p(95)=43.18ms p(99.9)=67.88ms
   - 2119.49123/s  p(95)=43.46ms  p(99.9)=69.59ms
 v3 + override
   - 2111.179508/s p(95)=43.71ms p(99.9)=67.74ms
   - 2101.72031/s  p(95)=43.86ms  p(99.9)=70.52ms
```

Author: kamilkisiela

bin/router/Cargo.toml

@@ -40,7 +40,7 @@ rand = { workspace = true }
 regex-automata = "0.4.10"
 jsonwebtoken = { workspace = true }
 
-mimalloc = { version = "0.1.47", features = ["override"] }
+mimalloc = { version = "0.1.48", features = ["v3"] }
 moka = { version = "0.12.10", features = ["future"] }
 ulid = "1.2.1"
 ntex = { workspace = true }