nip44: panic caused by uint16 overflow

[sebdeveloper6952]

unpaddedLen is a uint16:

go-nostr/nip44/nip44.go

Line 105 in 3ea2887

unpaddedLen uint16

if unpaddedLen holds the value 65535, adding 2 results in an overflow and a panic in line 143:

go-nostr/nip44/nip44.go

Line 143 in 3ea2887

unpadded = padded[2 : unpaddedLen+2]

panic: runtime error: slice bounds out of range [2:1]

goroutine 1 [running]:
github.com/nbd-wtf/go-nostr/nip44.Decrypt({0x140003a8000?, 0x14000390000?}, {0x14000026180, 0x20, 0x20})
	/Users/sebdev/Documents/sebas/projects/nostr/go-nostr/nip44/nip44.go:143 +0x5d4

Failing test case provided in my fork: https://github.com/sebdeveloper6952/go-nostr/blob/de50e524b7d7e41901b9ac07e9dda991166e3030/nip44/nip44_test.go#L227