chore: upgrading to TSC@3.7.3 (which supports optional chaining)

[sharkparty]

Before submitting a pull request, please make sure the following is done:

I have done all of the following:

• Added a top level class to all my components '.anchor-[COMPONENT NAME]'.
• Used conventional commits for all work.
• Tested my solution on Mobile & Tablet.
• Wrote unit tests for states and all behavior (npm test) and passed coverage thresholds.
• Updated snapshots for all permutations (npm test -- -u).
• Accounted for hover, focus, blur, visited, & error states because they are not edge cases.
• Created TODOs for known edge cases.
• Documented all of my changes (inline & doc site).
• Made sure that all accessibility errors are resolved.
• Added stories with knobs for all possible configurations.
• De-linted and ran prettier (npm run pretty) on my code.
• Added name to OWNERS file for all new components
• If adding a new component, add its export to the rollup config

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Outline your feature or bug-fix below

My code upgrades TSC