github: build: Use "stable" instead of concrete version of Rust

Signed-off-by: Michal Rostecki <[email protected]>

Author: vadorovsky

.github/workflows/build-test.yml

@@ -18,7 +18,7 @@ jobs:
       fail-fast: false
       matrix:
         rust:
-          - "1.63.0"
+          - "stable"
           - "beta"
           - "nightly"
         llvm: ["15", "rustc"]