upgrade to xxh3 hashing pkg

[pkieltyka]

• requires Go 1.23+
• switching from github.com/cespare/xxhash/v2 to github.com/zeebo/xxh3 for better hash function and faster

[github-actions]

Benchmark Results

goos: linux
goarch: amd64
pkg: github.com/go-chi/httprate
cpu: AMD EPYC 7763 64-Core Processor                
               │ master.txt  │            pr.txt             │
               │   sec/op    │   sec/op     vs base          │
LocalCounter-4   19.87m ± 1%   19.98m ± 1%  ~ (p=0.063 n=10)

               │  master.txt  │             pr.txt             │
               │     B/op     │     B/op      vs base          │
LocalCounter-4   2.830Mi ± 0%   2.835Mi ± 0%  ~ (p=0.280 n=10)

               │ master.txt  │            pr.txt             │
               │  allocs/op  │  allocs/op   vs base          │
LocalCounter-4   121.4k ± 0%   121.5k ± 0%  ~ (p=0.256 n=10)