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prepare release of SDK v0.15.23 - #6816
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…ing Rust 1.86 (#6817) ## Motivation CI on `testnet_conway` is red since `ad6ceee1fb` ("prepare release of SDK v0.15.23", #6816), in three jobs that all fail the same way: | Workflow / job | Failing test | |---|---| | Rust / default-features-and-witty-integration-test | `local::test_project_new` | | Rust / storage-service-tests | `test_project_publish::storage_service_grpc` | | ScyllaDB tests / test | `test_project_publish::scylladb_grpc` | ``` error: rustc 1.86.0 is not supported by the following packages: encoding_rs@0.8.41 requires rustc 1.88 ``` These tests build a project generated from `linera-service/template/Cargo.toml.template`, which has no lockfile, so Cargo resolves each dependency to its newest version. `encoding_rs` 0.8.40 (2026-09-07) and 0.8.41 (2026-09-09) raised the minimum Rust version to 1.88, while this branch is pinned to 1.86.0. The last green run predates 0.8.40 by about four hours. The workspace's own `Cargo.lock` still has 0.8.35, so nothing else is affected. Since the template ships inside the `linera` binary, `linera project new` also fails for users of the freshly released SDK v0.15.23. ## Proposal Cap `encoding_rs` below 0.8.40 in the template, next to the other versions pinned for Rust 1.86.0 under `TODO(#4742)`, as in #6707 and #6356. ## Test Plan CI, plus a local reproduction: instantiating the template by hand with `linera-sdk` as a path dependency and running the same command the test runs, `cargo build --release --target wasm32-unknown-unknown` on Rust 1.86.0. - without the pin: fails with the error above, identical to CI; - with the pin: resolves `encoding_rs` to 0.8.35 and builds cleanly, with no other crate reporting an incompatible minimum Rust version. ## Release Plan This PR targets `testnet_conway` directly and should go into the next SDK release from this branch. `main` is on Rust 1.95 and is not affected. ## Links - [reviewer checklist](https://github.com/linera-io/linera-protocol/blob/main/CONTRIBUTING.md#reviewer-checklist) - #6707, #6356: earlier pins of the same kind - #4742: tracking issue for removing these pins
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Motivation
Release #6815
Proposal
bump to version 0.15.23
Test Plan
CI