ci: use LLVM 21 #33258

1. 
   fanquake commented at 4:43 pm on August 26, 2025: member

   Use LLVM 21 in the *san & fuzz CIs.
2. ci: use LLVM 21 4cf0ae474b
3. DrahtBot added the label Tests on Aug 26, 2025
4. 
   DrahtBot commented at 4:43 pm on August 26, 2025: contributor

   The following sections might be updated with supplementary metadata relevant to reviewers and maintainers.

   Code Coverage & Benchmarks

   For details see: https://corecheck.dev/bitcoin/bitcoin/pulls/33258.

   Reviews

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   Type	Reviewers
   ACK	janb84, maflcko, l0rinc

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   Conflicts

   Reviewers, this pull request conflicts with the following ones:

   • #33201 (Add functional test for IPC interface by sipa)

   If you consider this pull request important, please also help to review the conflicting pull requests. Ideally, start with the one that should be merged first.

5. 
   janb84 commented at 6:29 pm on August 26, 2025: contributor

   ACK 4cf0ae474ba03830c86653f1abae4ab4d38c94e4

   LLVM 21 has been released (on 26 August 2025 ~14:19 UTC) ✅ Changed CI’s are running fine, they can download and run the new LLVM binaries. ✅

6. 
   maflcko commented at 6:27 am on August 28, 2025: member

   lgtm ACK 4cf0ae474ba03830c86653f1abae4ab4d38c94e4
7. l0rinc approved
8. 
   l0rinc commented at 6:33 am on August 28, 2025: contributor

   utACK 4cf0ae474ba03830c86653f1abae4ab4d38c94e4

   https://github.com/llvm/llvm-project/releases/tag/llvmorg-21.1.0 was just released 2 days ago

9. fanquake merged this on Aug 28, 2025
10. fanquake closed this on Aug 28, 2025

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11. fanquake deleted the branch on Aug 28, 2025

Contributors
fanquake DrahtBot janb84 maflcko l0rinc

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Tests