Update cbor-smol

[robin-nitrokey]

No description provided.

[nitrokey-ci]

metric	value		change
binary-size-nkpk	728591	✅	-8383 (-0.01%)

Insignifcant changes

metric	value		change
binary-size-nk3am	1188509	✅	-9135 (-0.01%)
binary-size-nk3am-test	2018402	🔴	+16667 (+0.01%)
binary-size-nk3xn	428036	✅	-3328 (-0.01%)
binary-size-nk3xn-test	545552	✅	-1952 (-0.00%)

[robin-nitrokey]

binary-size-nk3xn-test:

PR	value	change to main
Nitrokey/cbor-smol#2	565,240	+17,736
Nitrokey/cbor-smol#3	553,520	+6,016
Nitrokey/cbor-smol#4	545,552	-1,952

[robin-nitrokey]

@sosthene-nitrokey Should we merge this separately before #441 so that the cbor-smol update no longer affects the metrics for that PR? Alternatively, you can just use v0.4.0-nitrokey.3 in #441.

[sosthene-nitrokey]

I'll bump 441 to use the improved cbor-smol. Less merge conflicts.

[robin-nitrokey]

Included in #441.