ci(fuzz): upgrade nightly version to 2026-02-24

Author: delta1

.github/workflows/fuzz.yml

@@ -43,7 +43,7 @@ regression_value,
       - name: Install Toolchain
         uses: dtolnay/rust-toolchain@master
         with:
-          toolchain: nightly-2024-07-01
+          toolchain: nightly-2026-02-24
           components: "llvm-tools-preview"
 
       - name: Install Dependencies