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fix: assert type in `decodeJWTPayload` (#1018)

## What kind of change does this PR introduce?

Bug fix

## What is the current behavior?

Type checking and/or linting does not pass for some configurations, per
https://github.com/supabase/auth-js/issues/967 and
https://github.com/supabase/auth-js/issues/1017

## What is the new behavior?

We're now asserting that `parts[1]` is a string (aka isn't undefined),
since we know from a previous check that the array length is 3.

## Additional context

Fixes #967 and fixes #1017

Co-authored-by: Kang Ming <kang.ming1996@gmail.com>

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