Set CI test job to use MSRV version and llvm-tools

Author: mhatzl

.github/workflows/main.yml

@@ -37,6 +37,9 @@ jobs:
 
     steps:
       - uses: actions/checkout@v7
+      - uses: dtolnay/rust-toolchain@1.90.0
+        with:
+          components: llvm-tools
       - uses: taiki-e/install-action@nextest
       - uses: taiki-e/install-action@just
       - uses: taiki-e/install-action@grcov