Bump third_party/yosys from `672375e` to `6f1ca68`

[dependabot[bot]]

Bumps third_party/yosys from 672375e to 6f1ca68.

Commits

• 6f1ca68 Bump version
• 1260766 Merge pull request #4020 from YosysHQ/revert-4019-lofty/abc9-by-default
• b8b47f7 Revert "ice40, ecp5: enable ABC9 by default"
• deebb82 Merge pull request #4019 from YosysHQ/lofty/abc9-by-default
• 3208247 ice40, ecp5: enable ABC9 by default
• See full diff in compare view

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[dependabot[bot]]

Superseded by #339.