identity: Upgrade to github.com/mitchellh/hashstructure/v2 v2.0.2

identity: Upgrade to github.com/mitchellh/hashstructure/v2 v2.0.2

```
name                 old time/op    new time/op    delta
HashString/n28-10       131ns ± 7%     133ns ±19%   ~     (p=0.343 n=4+4)
HashString/n112-10      237ns ± 5%     241ns ± 3%   ~     (p=0.229 n=4+4)
HashString/n448-10      688ns ± 3%     687ns ± 1%   ~     (p=0.886 n=4+4)
HashString/n1792-10    2.51µs ± 3%    2.56µs ± 3%   ~     (p=0.200 n=4+4)
HashString/n7168-10    10.1µs ± 2%    10.0µs ± 4%   ~     (p=0.686 n=4+4)

name                 old alloc/op   new alloc/op   delta
HashString/n28-10       80.0B ± 0%     80.0B ± 0%   ~     (all equal)
HashString/n112-10       160B ± 0%      160B ± 0%   ~     (all equal)
HashString/n448-10       496B ± 0%      496B ± 0%   ~     (all equal)
HashString/n1792-10    1.84kB ± 0%    1.84kB ± 0%   ~     (all equal)
HashString/n7168-10    8.24kB ± 0%    8.24kB ± 0%   ~     (all equal)

name                 old allocs/op  new allocs/op  delta
HashString/n28-10        4.00 ± 0%      4.00 ± 0%   ~     (all equal)
HashString/n112-10       4.00 ± 0%      4.00 ± 0%   ~     (all equal)
HashString/n448-10       4.00 ± 0%      4.00 ± 0%   ~     (all equal)
HashString/n1792-10      4.00 ± 0%      4.00 ± 0%   ~     (all equal)
HashString/n7168-10      4.00 ± 0%      4.00 ± 0%   ~     (all equal)
```

Closes #11644