ci: no --locked for fuzzing

Author: asmie

.github/workflows/fuzz.yml

@@ -40,7 +40,7 @@ jobs:
       - name: Install nightly toolchain
         uses: dtolnay/rust-toolchain@nightly
       - name: Install cargo-fuzz
-        run: cargo install cargo-fuzz --locked
+        run: cargo install cargo-fuzz
       - name: Run fuzz target
         env:
           # Use env-var indirection per GitHub security guidance: matrix