PoW gone.

[DamianStraszak]

Removed the remaining traces of ID-HIDING.

Updated toolchain.

A few clippy changes resulting from toolchain bump.

[fbielejec]

maybe a comment for why this constraint is needed pls 🙇

[fbielejec]

lgtm, can be merged once we fix the CI problems

[github-actions]

Circuit	Metric	Main branch	New code	% Change
Deposit	advice_queries	$${\color{red}26}$$	$${\color{green}25}$$	$${\color{green}-3.85\%}$$
Deposit	fixed_queries	$${\color{red}14}$$	$${\color{green}12}$$	$${\color{green}-14.29\%}$$
Deposit	lookups	$${\color{red}1}$$	$${\color{green}0}$$	$${\color{green}-100.00\%}$$
Deposit	max_advice_rows	$${\color{red}864}$$	$${\color{green}785}$$	$${\color{green}-9.14\%}$$
Deposit	max_fixed_rows	$${\color{red}864}$$	$${\color{green}785}$$	$${\color{green}-9.14\%}$$
Deposit	max_rows	$${\color{red}864}$$	$${\color{green}785}$$	$${\color{green}-9.14\%}$$
Deposit	num_fixed_columns	$${\color{red}14}$$	$${\color{green}12}$$	$${\color{green}-14.29\%}$$
Deposit	num_total_columns	$${\color{red}24}$$	$${\color{green}22}$$	$${\color{green}-8.33\%}$$
Deposit	proof size	$${\color{red}3.9 KB}$$	$${\color{green}3.5 KB}$$	$${\color{green}-10.26\%}$$
Deposit	proving key size	$${\color{red}11.3 MB}$$	$${\color{green}10.6 MB}$$	$${\color{green}-6.19\%}$$
Deposit	verification key size	$${\color{red}1.9 KB}$$	$${\color{green}1.7 KB}$$	$${\color{green}-10.53\%}$$
Withdraw	max_advice_rows	$${\color{red}868}$$	$${\color{green}790}$$	$${\color{green}-8.99\%}$$
Withdraw	max_fixed_rows	$${\color{red}868}$$	$${\color{green}790}$$	$${\color{green}-8.99\%}$$
Withdraw	max_rows	$${\color{red}868}$$	$${\color{green}790}$$	$${\color{green}-8.99\%}$$