Replace interface{} with any (#25686)

Result of running `perl -p -i -e 's#interface\{\}#any#g' **/*` and `make fmt`.

Basically the same [as golang did](https://github.com/golang/go/commit/2580d0e08d5e9f979b943758d3c49877fb2324cb).

tests/test_utils.go

@@ -30,7 +30,7 @@ import (
 	"github.com/stretchr/testify/assert"
 )
 
-func exitf(format string, args ...interface{}) {
+func exitf(format string, args ...any) {
 	fmt.Printf(format+"\n", args...)
 	os.Exit(1)
 }
@@ -247,6 +247,6 @@ func PrintCurrentTest(t testing.TB, skip ...int) func() {
 }
 
 // Printf takes a format and args and prints the string to os.Stdout
-func Printf(format string, args ...interface{}) {
+func Printf(format string, args ...any) {
 	testlogger.Printf(format, args...)
 }