Bump actions-setup-minikube to 2.15.0

Use the latest minikube setup:
https://github.com/manusa/actions-setup-minikube/releases/tag/v2.15.0

JIRA: LIGHTY-424
Signed-off-by: tobias.pobocik <tobias.pobocik@pantheon.tech>
Signed-off-by: Ivan Hrasko <ivan.hrasko@pantheon.tech>

Author: Tobianas

.github/workflows/test-lighty-app.yml

@@ -38,7 +38,7 @@ jobs:
           key: ${{ runner.os }}-m2-${{ hashFiles('**/pom.xml') }}
           restore-keys: ${{ runner.os }}-m2
       - name: Setup Minikube
-        uses: manusa/actions-setup-minikube@v2.14.0
+        uses: manusa/actions-setup-minikube@v2.15.0
         with:
           minikube version: 'v1.35.0'
           kubernetes version: 'v1.33.0'