style: remove trailing whitespace & extra empty lines

Remove trailing whitespace and extra empty lines from the action file.

.github/workflows/ci.yml

@@ -137,14 +137,12 @@ jobs:
         with:
           github-token: ${{ secrets.GITHUB_TOKEN }}
           unittest-version: v0.3.4
-          
+
       - name: Check that helm-unittest is installed
         run: helm plugin list | sed 1d | awk '{print $1}' | grep -q '^unittest$'
 
       - name: Check that helm-unittest version is v0.3.4
         run: helm plugin list | awk '/^unittest\s/ { found = 1; print $2 } END { exit !found }' | grep -q '^0.3.4$'
-
-
 
   test-action-simple-install:
     name: Simple Install