[clang] [clang][Sema] Skip the RequiresExprBodyDecls for lambda dependencies (PR #83997)

[James Y Knight via cfe-commits]

jyknight wrote:

Can reduce further to:
```
template <typename T>
concept h = requires(T i) { [] {}(i); };

template <typename T> struct k;
template <h m> struct k<m> {
  struct n;
};
using o = k<int>::n;
```

But, is `requires(T i) { [] {}(i); };` actually valid? I think that _should_ fail the requirement, since you cannot call that lambda with an argument? Maybe that's just an artifact of the reduction?

https://github.com/llvm/llvm-project/pull/83997