fixed linter issues · cornell-dti/office-hours@6f40256

The following actions uses node12 which is deprecated and will be forced to run on node16: actions/setup-node@v1. For more info: https://github.blog/changelog/2023-06-13-github-actions-all-actions-will-run-on-node16-instead-of-node12-by-default/

Forbidden non-null assertion

Forbidden non-null assertion

Forbidden non-null assertion

'updateUser' is already declared in the upper scope

'updateAuthStatus' is already declared in the upper scope

'user' is already declared in the upper scope

Visible, non-interactive elements with click handlers must have at least one keyboard listener

Static HTML elements with event handlers require a role

Visible, non-interactive elements with click handlers must have at least one keyboard listener

Static HTML elements with event handlers require a role

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