compiler-context-analysis: Bump required Clang version to 23

Clang 23 introduces several major improvements:

1. Support for multiple arguments in the `guarded_by` and
   `pt_guarded_by` attributes [1]. This allows defining variables
   protected by multiple context locks, where read access requires
   holding at least one lock (shared or exclusive), and write access
   requires holding all of them exclusively.

2. Function pointer support [2]. We can now add attributes to function
   pointers just like we do on normal functions.

3. A fix to use arrays of locks [3]. Each index is now correctly treated
   as a separate lock instance.

4. A fix for implicit member access in attributes [4]. This allows to
   use __guarded_by(&foo->lock) correctly.

Overall that makes it worthwhile bumping the compiler version instead of
trying to make both Clang 22 and later work while supporting these new
features.

Signed-off-by: Marco Elver <elver@google.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Nathan Chancellor <nathan@kernel.org>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Link: https://github.com/llvm/llvm-project/pull/186838 [1]
Link: https://github.com/llvm/llvm-project/pull/191187 [2]
Link: https://github.com/llvm/llvm-project/pull/148551 [3]
Link: https://github.com/llvm/llvm-project/pull/194457 [4]
Link: https://patch.msgid.link/20260515124426.2227783-1-elver@google.com

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