don't test stage1 clippy in ci

Author: jyn514

src/ci/docker/host-x86_64/x86_64-gnu-llvm-15/script.sh

@@ -50,5 +50,5 @@ fi
 
 # Run clippy just to make sure it doesn't error out; we don't actually want to gate on the warnings
 # though.
+# Ideally we'd use stage 1, but that ICEs: https://github.com/rust-lang/rust-clippy/issues/11230
 ../x.py --stage 0 clippy -Awarnings
-../x.py --stage 1 clippy -Awarnings