Fix dub recipe for the lexer subpackage

[Vladiwostok]

Some of the errors.d code has been moved in sarif.d.

When using dmd in a dub project, dub fails to build the lexer subpackage due to the missing dependency.

This PR fixes the issue by specifying the sarif.d dependency in the lexer subpackage

[dlang-bot]

Thanks for your pull request and interest in making D better, @Vladiwostok! We are looking forward to reviewing it, and you should be hearing from a maintainer soon.
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Testing this PR locally

If you don't have a local development environment setup, you can use Digger to test this PR:

dub run digger -- build "master + dmd#17031"

[thewilsonator]

Thanks!