Update depend/zcash to v5.5.0

```sh git subtree add -P depend/zcash https://github.com/zcash/zcash.git v5.5.0 --squash git rm depend/zcash/Cargo.toml ```
ZcashFoundation · May 2, 2023 · 50bbffc · 50bbffc
1 parent 426e8c3
commit 50bbffc
Showing 1 changed file with 0 additions and 114 deletions.
diff --git a/depend/zcash/Cargo.toml b/depend/zcash/Cargo.toml