all: use any instead of interface{}

My favorite part of generics.

Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>

types/opt/bool.go

@@ -30,7 +30,7 @@ func (b Bool) Get() (v bool, ok bool) {
 }
 
 // Scan implements database/sql.Scanner.
-func (b *Bool) Scan(src interface{}) error {
+func (b *Bool) Scan(src any) error {
 	if src == nil {
 		*b = ""
 		return nil

types/opt/bool_test.go

@@ -13,7 +13,7 @@ import (
 func TestBool(t *testing.T) {
 	tests := []struct {
 		name string
-		in   interface{}
+		in   any
 		want string // JSON
 	}{
 		{