change (3rd_party_board): XIAO_C3 delete the definition of pin A3

[Lesords]

Description of Change

Delete the definition of pin A3

Reason

Because A3 corresponds to GPIO5, which happens to be ADC2, and ADC2 is not currently supported, so A3 is currently useless.

[CLAassistant]

All committers have signed the CLA.

[github-actions]

Warnings

⚠️

Some issues found for the commit messages in this PR: the commit message "chore: delete the definition of pin A3": type/action should be one of [change, ci, docs, feat, fix, refactor, remove, revert, test] Please fix these commit messages - here are some basic tips: follow Conventional Commits style correct format of commit message should be: <type/action>(<scope/component>): <summary>, for example fix(esp32): Fixed startup timeout issue allowed types are: change,ci,docs,feat,fix,refactor,remove,revert,test sufficiently descriptive message summary should be between 20 to 72 characters and start with upper case letter avoid Jira references in commit messages (unavailable/irrelevant for our customers) TIP: Install pre-commit hooks and run this check when committing (uses the Conventional Precommit Linter).

👋 Hello Lesords, we appreciate your contribution to this project!

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[lucasssvaz]

Could you please fill the PR description for us to know why the pin is being removed ?

[Lesords]

Could you please fill the PR description for us to know why the pin is being removed ?

Okay, I updated it now