Bump verilator/master from `feae9ca` to `aa4346a`

[dependabot[bot]]

Bumps verilator/master from feae9ca to aa4346a.

Commits

• aa4346a Tests: Add test for unfixed (#4237)
• 8c541a6 Tests: Add test for unfixed (#4038)
• 1a43afe Fix $finish twice to no longer exit (#4757).
• 9882c4c Github: Commentary
• 54ad04b Fix 'for' loop with outside variable reference (#4660).
• 540cd77 Add user C/C++ code to final achieve, and make a libmodel.a (#4749) (#4754)
• 621de30 Run the V3Fork stage only if --timing is set (#4778)
• 8769c1a Internals: Add -fno-dead-cells, -fno-dead-assigns for debug use
• 8e1c0b0 Apply 'make format'
• 56d6791 Support invoking interface methods on virtual interface variables (#4774) (#4...
• Additional commits viewable in compare view

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[dependabot[bot]]

Superseded by #461.