chore: update golangci-lint to v1.64.8 and disable use-errors-new rule

Update linter version from 1.60.3 to 1.64.8 to support newer Go modules.
Disable new use-errors-new revive rule to avoid breaking changes on release branch.

Author: weeco

backend/.golangci.yaml

@@ -207,3 +207,5 @@ linters-settings:
         disabled: true
       - name: var-naming
         disabled: true
+      - name: use-errors-new
+        disabled: true

taskfiles/backend.yaml

@@ -17,7 +17,7 @@ tasks:
   install-golangci-lint:
     desc: install golangci linter
     vars:
-      GO_LINT_VERSION: 1.60.3
+      GO_LINT_VERSION: 1.64.8
     cmds:
       - mkdir -p {{ .BUILD_ROOT}}/bin
       - curl -sSfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sh -s -- -b "{{ .BUILD_ROOT }}"/bin/go v{{ .GO_LINT_VERSION }}