Action's local cache lookup fails with lowercase name reference

Error description

setup-localstack run fails at the sub-module lookup if the name set in a lower-case manner.

uses: localstack/setup-localstack@v0.2.0 ...

Make setup-localstack case insensitive by using grep -i in the local cache hack.

Line 75 in 4b405a2

     - run: echo "$(ls -d ./../../_actions/LocalStack/setup-localstack/* | grep -v completed)"  
 