Merge pull request ruby#2925 from Shopify/disable-rust-ci

Stop triggering Rust CI on C source changes

Author: soutaro

.github/workflows/rust.yml

@@ -8,8 +8,6 @@ on:
     paths:
       - ".github/workflows/rust.yml"
       - "rust/**"
-      - "include/**"
-      - "src/**"
 
 env:
   RUSTFLAGS: "-D warnings"