supabase / auth / 23815831910

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chore: prevent panic by enforcing nonce length (#2459)

## What kind of change does this PR introduce?

Bug fix / chore

## What is the current behavior?

Current `IsValid` in `crypto.go` only validates that the nonce length is
> 0. `cipher.NewGCM()` from the Go standard library panics if the nonce
is not exactly 12 bytes.

## What is the new behavior?

Matches the `IsValid` check with the behaviour of `cipher.NewGCM()` and
prevents a panic.

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