Track the nightly channel for ClusterFuzzLite instead of a dated toolchain.

A pinned nightly would need another bump the next time rust-version moves.

Co-authored-by: Cursor <cursoragent@cursor.com>

Author: zh-jq

.clusterfuzzlite/Dockerfile

@@ -2,11 +2,11 @@ FROM gcr.io/oss-fuzz-base/base-builder-rust
 
 # base-builder-rust pins RUSTUP_TOOLCHAIN=nightly-2025-09-05 (rustc 1.91.0-nightly).
 # Cargo rejects that compiler because these crates set rust-version = "1.95.0".
-# Point rustup at a newer nightly, and make it the default so the OSS-Fuzz
+# Follow the nightly channel instead, and make it the default so the OSS-Fuzz
 # compile script copies libstd sources from the same toolchain.
-ENV RUSTUP_TOOLCHAIN=nightly-2026-10-05
-RUN rustup toolchain install nightly-2026-10-05 --profile minimal --component rust-src \
-    && rustup default nightly-2026-10-05
+ENV RUSTUP_TOOLCHAIN=nightly
+RUN rustup toolchain install nightly --profile minimal --component rust-src \
+    && rustup default nightly
 
 RUN apt-get update && apt-get install -y --no-install-recommends zip \
     && rm -rf /var/lib/apt/lists/*