Fix CI: Use golangci-lint v2 GitHub Action

The configuration file is for v2, but CI was installing v1.
Use the official golangci-lint GitHub Action which handles v2 correctly.

.github/workflows/ci.yml

@@ -132,9 +132,9 @@ jobs:
           fi
 
       - name: Install golangci-lint
-        run: |
-          go install github.com/golangci/golangci-lint/cmd/golangci-lint@latest
-          echo "$HOME/go/bin" >> $GITHUB_PATH
+        uses: golangci/golangci-lint-action@v6
+        with:
+          version: v2
 
       - name: Run linters
         run: make lint

services/gateway/gateway_helpers_test.go

@@ -182,4 +182,3 @@ func TestGateway_matchRoute(t *testing.T) {
 		})
 	}
 }
-

services/gateway/handlers_test.go

@@ -517,4 +517,3 @@ func TestGateway_handleGRPCError(t *testing.T) {
 		})
 	}
 }
-

services/identity/internal/password/password_test.go

@@ -239,4 +239,3 @@ func joinHash(parts []string) string {
 	}
 	return result
 }
-