github-ci: use rust 1.85.0 for clippy check on templates

Currently our CI clippy test is based on 1.85.0, but the clippy test for
the templates was using latest stable.  Unify the clippy checks to
1.85.0.

.github/workflows/builds.yml

@@ -283,7 +283,7 @@ jobs:
                 sudo \
                 which \
                 zlib-devel
-      - run: curl https://sh.rustup.rs -sSf | sh -s -- --default-toolchain stable -y
+      - run: curl https://sh.rustup.rs -sSf | sh -s -- --default-toolchain 1.85.0 -y
       - run: echo "$HOME/.cargo/bin" >> $GITHUB_PATH
       - run: rustup component add rustfmt
       - run: rustup component add clippy