[sgl-router] Prepare dynamo-render dependencies (#39457)

Co-authored-by: Claude Fable 5.1 <noreply@anthropic.com>

experimental/sgl-router/tests/e2e/k8s_integration/Dockerfile.router

@@ -3,14 +3,14 @@
 # Context root: repo root (one level above experimental/sgl-router/).
 
 # Matches rust-toolchain.toml's pinned channel, avoiding an in-build rustup channel-sync.
-FROM rust:1.90-bookworm AS builder
+FROM rust:1.92-bookworm AS builder
 
 # Pin to the exact toolchain pre-installed in the base image so rustup
 # doesn't try to sync the channel manifest when it sees rust-toolchain.toml's
-# `channel = "1.90"`.
-ENV RUSTUP_TOOLCHAIN=1.90.0
+# `channel = "1.92"`.
+ENV RUSTUP_TOOLCHAIN=1.92.0
 
-# libssl-dev + pkg-config ship with rust:1.90-bookworm already; protoc does not,
+# libssl-dev + pkg-config ship with rust:1.92-bookworm already; protoc does not,
 # and the Indexer's build script needs it to compile the KV-indexer protos.
 RUN apt-get update \
     && apt-get install -y --no-install-recommends protobuf-compiler \
@@ -25,7 +25,7 @@ RUN --mount=type=cache,target=/usr/local/cargo/registry \
     --mount=type=cache,target=/usr/local/cargo/git \
     --mount=type=cache,target=/build/experimental/sgl-router/target \
     cd /build/experimental/sgl-router \
-    && cargo build --release --bin sgl-router \
+    && cargo build --locked --release --bin sgl-router \
     && cp target/release/sgl-router /usr/local/bin/sgl-router
 
 FROM debian:bookworm-slim