Update lint-action to v2

Motivation: 
https://github.com/joelanford/helm-operator/issues/64

Ref: https://github.com/golangci/golangci-lint-action#how-to-use

Author: anmol372

.github/workflows/ci.yml

@@ -53,9 +53,9 @@ jobs:
       uses: actions/checkout@v2
 
     - name: Lint
-      uses: golangci/golangci-lint-action@v1
+      uses: golangci/golangci-lint-action@v2
       with:
-        version: v1.27
+        version: v1.29
 
   deploy:
     name: Deploy