zig: use llvm@13

[nektro]

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follow up to #97618

zig 0.9.1 and master both still use llvm13. once 0.10.0 is released it can be updated again to be llvm@14

[SMillerDev]

Does it fail with 14?

[nektro]

yes

[cho-m]

Since this modifies dependency, it should have a revision bump to distribute change to users. This can be done by adding revision 1 on line after the license

[matthewsanetra]

@nektro Apologies, just a polite reminder about this PR!

[chenrui333]

upstream is trying to upgrade to support llvm@14, ziglang/zig#12001

[chenrui333]

it would be actually great to specify the default branch, but I think we can followup in the next run.

[BrewTestBot]

🤖 A scheduled task has triggered a merge.