build(deps): bump third_party/migen from `ccaee68` to `4790bb5`

[dependabot[bot]]

Bumps third_party/migen from ccaee68 to 4790bb5.

Commits

• 4790bb5 Updated EEM FMC Carrier platform for v1.1
• 50934ad pyproject.toml: add build backend
• fd0bf58 doc: update installation instructions
• ecc1efe doc: fix URLs
• 3ba41c0 platforms/quickfeather: fix incorrect use of 'is'
• aadc19d zc706: correct the speed grade in fpga part number
• 2cfee3e Replace setup.py with pyproject.toml
• See full diff in compare view

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