lint-test: Pin unitttest plugin on version 1.0.2

Signed-off-by: Haitao Li <hli@atlassian.com>

Author: hligit

.github/workflows/lint-test.yaml

@@ -17,7 +17,7 @@ jobs:
           version: v3.13.1
 
       - name: Install helm-unittest plugin
-        run: helm plugin install https://github.com/helm-unittest/helm-unittest
+        run: helm plugin install --version 1.0.2 https://github.com/helm-unittest/helm-unittest
 
       - name: Add Helm repo
         run: |