fix duplicate lang item error in size-cmp workflow

Author: Madoshakalaka

.github/workflows/size-cmp.yml

@@ -32,7 +32,7 @@ jobs:
 
       - name: Write Optimisation Flags
         run: |
-          echo 'build-std = ["std", "panic_abort"]' >> .cargo/config.toml
+          echo 'build-std = ["std", "panic_abort", "alloc"]' >> .cargo/config.toml
           echo 'build-std-features = ["panic_immediate_abort"]' >> .cargo/config.toml
           echo '[build]' >> .cargo/config.toml
           echo 'rustflags = ["-Cpanic=abort"]' >> .cargo/config.toml