build(deps): bump third_party/icestorm from `10ed413` to `2bc5417`

[dependabot[bot]]

Bumps third_party/icestorm from 10ed413 to 2bc5417.

Commits

• 2bc5417 Update COPYING
• 752c96a Change help message
• cb067cf Merge pull request #278 from davidthings/master
• 29556af Merge pull request #283 from smunaut/misc
• eaea10b Merge pull request #291 from maikmerten/master
• c9ad6ca icetime: indent with tabs
• 5b5c7ce icetime PCF parsing: handle -pullup and -pullup_resistor in set_io constraints
• 98d8bee iceprog: Use open-drain output to drive SS and Reset line
• c5a8bef iceprog: Improve reset to disable both CRM and QPI
• 502d847 iceprog: Add option that set QE=1 bit in SR2
• Additional commits viewable in compare view

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