build(deps): bump third_party/tools/verilator-uhdm from `012ce2f` to `6db149c`

[dependabot[bot]]

Bumps third_party/tools/verilator-uhdm from 012ce2f to 6db149c.

Commits

• 6db149c Fix generate blocks in vpi_iterate (#3609) (#4913)
• 0fed5f8 Avoid creating redundant vertices in V3DfgPeephole (#4944)
• a30930b Fix unsound temporary name generation in V3DfgRegularize
• 3a1355f Fix bad assertion in DFG variable elimination
• 97db128 Tests: Add VPI dump testcases (#4838)
• 3d57256 Commentary: Changes update
• 5dc8fb5 Commentary (#4930)
• 3f0d434 Gtkwave: Update from upstream for warning cleanup (#4941)
• 2cdc5ea Fix unaligned access in --trace --runtime-debug (#4941).
• 745605e Fix DFG removing forceable signals (#4942)
• Additional commits viewable in compare view

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