Remove default shell

Signed-off-by: David Calavera <[email protected]>

Author: calavera

.github/workflows/build.yml

@@ -305,9 +305,6 @@ jobs:
     runs-on: ${{ matrix.os }}
     env:
       CARGO_LAMBDA_VERSION: 0.15.0
-    defaults:
-      run:
-        shell: bash
     strategy:
       fail-fast: false
       matrix: