Changes required for keystone support that require dependency updates beyond what we can currently do.

[nuttycom]

Depends on zcash/orchard#446.

This is a feature branch depended on by the downstream Keystone firmware; do not rebase it.

[codecov]

Codecov Report

Attention: Patch coverage is 10.93750% with 57 lines in your changes missing coverage. Please review.

Project coverage is 52.93%. Comparing base (a1e4e7a) to head (ab80376).
Report is 10 commits behind head on main.

Files with missing lines	Patch %	Lines
pczt/src/common.rs	0.00%	27 Missing ⚠️
pczt/src/roles/low_level_signer/mod.rs	0.00%	24 Missing ⚠️
devtools/src/bin/inspect/transaction.rs	0.00%	2 Missing ⚠️
zcash_transparent/src/builder.rs	0.00%	2 Missing ⚠️
zcash_transparent/src/keys.rs	87.50%	1 Missing ⚠️
zcash_transparent/src/pczt/signer.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1666      +/-   ##
==========================================
- Coverage   52.94%   52.93%   -0.02%     
==========================================
  Files         175      176       +1     
  Lines       21072    21104      +32     
==========================================
+ Hits        11157    11171      +14     
- Misses       9915     9933      +18     

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