fix: update Rust toolchain action to use master branch and specify nightly version

Author: jlucaso1

.github/workflows/ci.yml

@@ -20,9 +20,10 @@ jobs:
     steps:
       - uses: actions/checkout@v6
 
-      - name: Install Rust (nightly)
-        uses: dtolnay/rust-toolchain@nightly
+      - name: Install Rust
+        uses: dtolnay/rust-toolchain@master
         with:
+          toolchain: nightly-2026-01-30
           components: rustfmt, clippy
           targets: wasm32-unknown-unknown
 
@@ -42,9 +43,10 @@ jobs:
     steps:
       - uses: actions/checkout@v6
 
-      - name: Install Rust (nightly)
-        uses: dtolnay/rust-toolchain@nightly
+      - name: Install Rust
+        uses: dtolnay/rust-toolchain@master
         with:
+          toolchain: nightly-2026-01-30
           targets: wasm32-unknown-unknown
 
       - name: Cache Rust dependencies