mod: bump github.com/golangci/golangci-lint from 1.55.2 to 1.56.2

Bumps [github.com/golangci/golangci-lint](https://github.com/golangci/golangci-lint) from 1.55.2 to 1.56.2.
- [Release notes](https://github.com/golangci/golangci-lint/releases)
- [Changelog](https://github.com/golangci/golangci-lint/blob/master/CHANGELOG.md)
- [Commits](https://github.com/golangci/golangci-lint/compare/v1.55.2...v1.56.2)

---
updated-dependencies:
- dependency-name: github.com/golangci/golangci-lint
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

1 files changed, 23 insertions, 0 deletions

diff --git a/vendor/github.com/go-toolsmith/astequal/diff.go b/vendor/github.com/go-toolsmith/astequal/diff.go
new file mode 100644
index 000000000..cd69b4525
--- /dev/null
+++ b/vendor/github.com/go-toolsmith/astequal/diff.go
@@ -0,0 +1,23 @@
+package astequal
+
+import (
+	"bytes"
+	"go/ast"
+	"go/format"
+	"go/token"
+
+	"github.com/google/go-cmp/cmp"
+)
+
+func Diff(x, y ast.Node) string {
+	var buf bytes.Buffer
+	format.Node(&buf, token.NewFileSet(), x)
+	s1 := buf.String()
+
+	buf.Reset()
+	format.Node(&buf, token.NewFileSet(), y)
+	s2 := buf.String()
+
+	// TODO(cristaloleg): replace with a more lightweight diff impl.
+	return cmp.Diff(s1, s2)
+}