CI: Don't test `zcash_client_backend/lightwalletd-tonic` on WASM

Broken until hyperium/tonic#1783 is addressed.

.github/workflows/ci.yml

@@ -195,7 +195,7 @@ jobs:
         run: cargo add --no-default-features --path ../crates/zcash_proofs
       - name: Add zcash_client_backend as a dependency of the synthetic crate
         working-directory: ./ci-build
-        run: cargo add --features lightwalletd-tonic --path ../crates/zcash_client_backend
+        run: cargo add --path ../crates/zcash_client_backend
       - name: Copy pinned dependencies into synthetic crate
         run: cp crates/Cargo.lock ci-build/
       - name: Add target

zcash_client_backend/CHANGELOG.md

@@ -22,6 +22,8 @@ and this library adheres to Rust's notion of
 ### Changed
 - MSRV is now 1.70.0.
 - Migrated to `tonic 0.12`.
+  - The `lightwalletd-tonic` feature flag no longer works on `wasm32-wasi` due
+    to https://github.com/hyperium/tonic/issues/1783.
 - `zcash_client_backend::{fixed,standard,zip317}::SingleOutputChangeStrategy`
   now implement a different strategy for choosing whether there will be any
   change, and its value. This can avoid leaking information about note amounts