fix(ci): update Rust in Docker before building native

Docker images have Rust 1.83 but napi-build@2.3.1 requires 1.88+.
Add `rustup update stable` before build in Linux Docker jobs.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: MikotoZero

.github/workflows/build-native.yml

@@ -55,6 +55,7 @@ jobs:
             artifact: taptap-signer.linux-x64-gnu.node
             docker: ghcr.io/napi-rs/napi-rs/nodejs-rust:lts-debian
             build: |
+              rustup update stable && rustup default stable
               cd native
               npm run build -- --target x86_64-unknown-linux-gnu
               strip *.node
@@ -65,6 +66,7 @@ jobs:
             artifact: taptap-signer.linux-x64-musl.node
             docker: ghcr.io/napi-rs/napi-rs/nodejs-rust:lts-alpine
             build: |
+              rustup update stable && rustup default stable
               cd native
               npm run build -- --target x86_64-unknown-linux-musl
               strip *.node
@@ -75,6 +77,7 @@ jobs:
             artifact: taptap-signer.linux-arm64-musl.node
             docker: ghcr.io/napi-rs/napi-rs/nodejs-rust:lts-alpine
             build: |
+              rustup update stable && rustup default stable
               cd native
               npm run build -- --target aarch64-unknown-linux-musl
               strip *.node

.github/workflows/release.yml

@@ -97,6 +97,7 @@ jobs:
             target: x86_64-unknown-linux-gnu
             docker: ghcr.io/napi-rs/napi-rs/nodejs-rust:lts-debian
             build: |
+              rustup update stable && rustup default stable
               cd native
               npm run build -- --target x86_64-unknown-linux-gnu
               strip *.node
@@ -106,6 +107,7 @@ jobs:
             target: x86_64-unknown-linux-musl
             docker: ghcr.io/napi-rs/napi-rs/nodejs-rust:lts-alpine
             build: |
+              rustup update stable && rustup default stable
               cd native
               npm run build -- --target x86_64-unknown-linux-musl
               strip *.node