build(deps): bump third_party/litex-boards from `ea58ef9` to `8c3a5c0`

[dependabot[bot]]

Bumps third_party/litex-boards from ea58ef9 to 8c3a5c0.

Commits

• 8c3a5c0 sipeed_tang_nano_9k: Fix HDMI IOs constraints.
• 9cd1c1c targets/digilent_arty: Switch with_buttons to False by default (To fix #426).
• dcb9e2b Merge pull request #424 from slagernate/main
• 9dbee62 add option to use ecpprog for crosslink-nx eval board
• 3018089 test/test_targets: Exclude newae_cw305 from platform tests.
• 3cef11e platforms/newae_cw305: Add sma_clk_in/out, buttons, switches and expansion he...
• f189995 Add initial NewAE CW305 board support.
• 7b2e94b Merge pull request #422 from azzeloof/master
• 25c28d2 fixed issue with default programmer option
• 6768be7 changed use example comment
• Additional commits viewable in compare view

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