chore: remove unused dependencies (#4809)

## Describe your changes

Removes unused dependencies, detected with `cargo +nightly udeps
--all-targets --all-features`

## Checklist before requesting a review

- [ ] If this code contains consensus-breaking changes, I have added the
"consensus-breaking" label. Otherwise, I declare my belief that there
are not consensus-breaking changes, for the following reason:

  > only removes dependencies, should be good if tests pass

crates/core/app/Cargo.toml

@@ -53,7 +53,6 @@ penumbra-sct                     = { workspace = true, default-features = true }
 penumbra-shielded-pool           = { workspace = true, features = ["component"], default-features = true }
 penumbra-stake                   = { workspace = true, default-features = true }
 penumbra-tct                     = { workspace = true, default-features = true }
-penumbra-tendermint-proxy        = { path = "../../util/tendermint-proxy" }
 penumbra-test-subscriber         = { workspace = true }
 penumbra-tower-trace             = {  path = "../../util/tower-trace"  }
 penumbra-transaction             = { workspace = true, features = ["parallel"], default-features = true }

crates/crypto/proof-params/Cargo.toml

@@ -44,7 +44,6 @@ ark-snark = {workspace = true}
 ark-std = {workspace = true, default-features = false}
 bech32 = {workspace = true}
 decaf377 = {workspace = true, features = ["r1cs"], default-features = true}
-lazy_static = "1.4.0"
 num-bigint = {workspace = true}
 once_cell = {workspace = true}
 rand = {workspace = true}