Update golangci-lint to v2.6.1 in CI workflow

Bumps the golangci-lint version used in the CI workflow from v1.64.8 to v2.6.1 to ensure the latest linting features and bug fixes are applied.

Author: jferrl

.github/workflows/ci.yaml

@@ -16,7 +16,7 @@ jobs:
       - name: golangci-lint
         uses: golangci/golangci-lint-action@v6
         with:
-          version: v1.64.8
+          version: v2.6.1
 
   test:
     runs-on: ubuntu-latest