Remove redundant CI test

Author: bushrat011899

.github/workflows/tests.yml

@@ -77,10 +77,6 @@ jobs:
           RUSTFLAGS: -Dwarnings --cfg getrandom_backend="rdrand"
           RUSTDOCFLAGS: -Dwarnings --cfg getrandom_backend="rdrand"
         run: cargo test --features=std,sys_rng
-      - env:
-          RUSTFLAGS: -Dwarnings --cfg getrandom_backend="extern_item_impls"
-          RUSTDOCFLAGS: -Dwarnings --cfg getrandom_backend="extern_item_impls"
-        run: cargo test --target=${{ matrix.target }} --features=std --test mod extern_item_impls
 
   extern_item_impls:
     name: Extern Item Implementations