build(deps): bump third_party/litex-boards from `63b65e2` to `bf123db`

[dependabot-preview[bot]]

Bumps third_party/litex-boards from 63b65e2 to bf123db.

Commits

• bf123db icebreaker/fomu: Update flashing and disconnect reset from SoC (will need pro...
• c010b9a Merge pull request #215 from hansfbaier/qmtech-xc7a35t
• 76078c9 Merge pull request #214 from hansfbaier/icesugar
• ddaab53 qmtech_xc7a35 set symbiflow_device, needed when using symbiflow
• df447dd QMTech XC7A35T: fix argument parser description
• f2b51b0 icesugar: map the usb port
• 5027b27 init.py: Add muselab to vendors.
• e99272c muselab_icesugar: Modify comments a bit.
• 5ae1306 Merge pull request #213 from hansfbaier/icesugar
• 2c2a9db Merge pull request #212 from hansfbaier/qmtech-xc7a35t
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[dependabot-preview[bot]]

Superseded by #706.