Update docker/login-action digest to 40891eb (#42)

Author: joshuanianji

.github/actions/deploy-image/action.yml

@@ -49,7 +49,7 @@ runs:
       uses: ./.github/actions/get-idris-sha
 
     - name: Login to GHCR
-      uses: docker/login-action@f4ef78c080cd8ba55a85445d5b36e214a81df20a
+      uses: docker/login-action@40891eba8c2bcd1309b07ba8b11232f313e86779
       with:
         registry: ghcr.io
         username: ${{ github.actor }}