[ruby-core:116965] [Ruby master Bug#20307] `Hash#update` from compare_by_identity hash can have unfrozen string keys

Issue #20307 has been reported by nobu (Nobuyoshi Nakada).

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Bug #20307: `Hash#update` from compare_by_identity hash can have unfrozen string keys
https://bugs.ruby-lang.org/issues/20307

* Author: nobu (Nobuyoshi Nakada)
* Status: Open
* Backport: 3.0: REQUIRED, 3.1: REQUIRED, 3.2: REQUIRED, 3.3: REQUIRED
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I don't think this behavior is expected.

```ruby
i = Hash.new.compare_by_identity
k = "a"
i[k] = 0
h = {}.update(i)
p h["a"]            # => 0
k.upcase!
p h.fetch(k)        # in 'Hash#fetch': key not found: "A" (KeyError)
```




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